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| <div class="section" id="image-manipulation-class"> |
| <h1>Image Manipulation Class<a class="headerlink" href="#image-manipulation-class" title="Permalink to this headline">¶</a></h1> |
| <p>CodeIgniter’s Image Manipulation class lets you perform the following |
| actions:</p> |
| <ul class="simple"> |
| <li>Image Resizing</li> |
| <li>Thumbnail Creation</li> |
| <li>Image Cropping</li> |
| <li>Image Rotating</li> |
| <li>Image Watermarking</li> |
| </ul> |
| <p>All three major image libraries are supported: GD/GD2, NetPBM, and |
| ImageMagick</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Watermarking is only available using the GD/GD2 library. In |
| addition, even though other libraries are supported, GD is required in |
| order for the script to calculate the image properties. The image |
| processing, however, will be performed with the library you specify.</p> |
| </div> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><a class="reference internal" href="#initializing-the-class" id="id1">Initializing the Class</a><ul> |
| <li><a class="reference internal" href="#processing-an-image" id="id2">Processing an Image</a></li> |
| <li><a class="reference internal" href="#processing-methods" id="id3">Processing Methods</a></li> |
| <li><a class="reference internal" href="#preferences" id="id4">Preferences</a></li> |
| <li><a class="reference internal" href="#setting-preferences-in-a-config-file" id="id5">Setting preferences in a config file</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#image-watermarking" id="id6">Image Watermarking</a><ul> |
| <li><a class="reference internal" href="#two-types-of-watermarking" id="id7">Two Types of Watermarking</a></li> |
| <li><a class="reference internal" href="#watermarking-an-image" id="id8">Watermarking an Image</a></li> |
| <li><a class="reference internal" href="#watermarking-preferences" id="id9">Watermarking Preferences</a><ul> |
| <li><a class="reference internal" href="#text-preferences" id="id10">Text Preferences</a></li> |
| <li><a class="reference internal" href="#overlay-preferences" id="id11">Overlay Preferences</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#class-reference" id="id12">Class Reference</a></li> |
| </ul> |
| </div> |
| <div class="custom-index container"></div><div class="section" id="initializing-the-class"> |
| <h2><a class="toc-backref" href="#id1">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h2> |
| <p>Like most other classes in CodeIgniter, the image class is initialized |
| in your controller using the $this->load->library function:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'image_lib'</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>Once the library is loaded it will be ready for use. The image library |
| object you will use to call all functions is: <code class="docutils literal"><span class="pre">$this->image_lib</span></code></p> |
| <div class="section" id="processing-an-image"> |
| <h3><a class="toc-backref" href="#id2">Processing an Image</a><a class="headerlink" href="#processing-an-image" title="Permalink to this headline">¶</a></h3> |
| <p>Regardless of the type of processing you would like to perform |
| (resizing, cropping, rotation, or watermarking), the general process is |
| identical. You will set some preferences corresponding to the action you |
| intend to perform, then call one of four available processing functions. |
| For example, to create an image thumbnail you’ll do this:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'image_library'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'gd2'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'create_thumb'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'maintain_ratio'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'width'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">75</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'height'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">50</span><span class="p">;</span> |
| |
| <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'image_lib'</span><span class="p">,</span> <span class="nv">$config</span><span class="p">);</span> |
| |
| <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">resize</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>The above code tells the image_resize function to look for an image |
| called <em>mypic.jpg</em> located in the source_image folder, then create a |
| thumbnail that is 75 X 50 pixels using the GD2 image_library. Since the |
| maintain_ratio option is enabled, the thumb will be as close to the |
| target width and height as possible while preserving the original aspect |
| ratio. The thumbnail will be called <em>mypic_thumb.jpg</em> and located at |
| the same level as <em>source_image</em>.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">In order for the image class to be allowed to do any |
| processing, the folder containing the image files must have write |
| permissions.</p> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Image processing can require a considerable amount of server |
| memory for some operations. If you are experiencing out of memory errors |
| while processing images you may need to limit their maximum size, and/or |
| adjust PHP memory limits.</p> |
| </div> |
| </div> |
| <div class="section" id="processing-methods"> |
| <h3><a class="toc-backref" href="#id3">Processing Methods</a><a class="headerlink" href="#processing-methods" title="Permalink to this headline">¶</a></h3> |
| <p>There are four available processing methods:</p> |
| <ul class="simple"> |
| <li>$this->image_lib->resize()</li> |
| <li>$this->image_lib->crop()</li> |
| <li>$this->image_lib->rotate()</li> |
| <li>$this->image_lib->watermark()</li> |
| </ul> |
| <p>These methods return boolean TRUE upon success and FALSE for failure. |
| If they fail you can retrieve the error message using this function:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>A good practice is to use the processing function conditionally, showing an |
| error upon failure, like this:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">resize</span><span class="p">())</span> |
| <span class="p">{</span> |
| <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p>You can optionally specify the HTML formatting to be applied to |
| the errors, by submitting the opening/closing tags in the function, |
| like this:</p> |
| <div class="last highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">(</span><span class="s1">'<p>'</span><span class="p">,</span> <span class="s1">'</p>'</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="preferences"> |
| <span id="processing-preferences"></span><h3><a class="toc-backref" href="#id4">Preferences</a><a class="headerlink" href="#preferences" title="Permalink to this headline">¶</a></h3> |
| <p>The preferences described below allow you to tailor the image processing |
| to suit your needs.</p> |
| <p>Note that not all preferences are available for every function. For |
| example, the x/y axis preferences are only available for image cropping. |
| Likewise, the width and height preferences have no effect on cropping. |
| The “availability” column indicates which functions support a given |
| preference.</p> |
| <p>Availability Legend:</p> |
| <ul class="simple"> |
| <li>R - Image Resizing</li> |
| <li>C - Image Cropping</li> |
| <li>X - Image Rotation</li> |
| <li>W - Image Watermarking</li> |
| </ul> |
| <table border="1" class="docutils"> |
| <colgroup> |
| <col width="14%" /> |
| <col width="14%" /> |
| <col width="19%" /> |
| <col width="45%" /> |
| <col width="8%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr class="row-odd"><th class="head">Preference</th> |
| <th class="head">Default Value</th> |
| <th class="head">Options</th> |
| <th class="head">Description</th> |
| <th class="head">Availability</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr class="row-even"><td><strong>image_library</strong></td> |
| <td>GD2</td> |
| <td>GD, GD2, ImageMagick, NetPBM</td> |
| <td>Sets the image library to be used.</td> |
| <td>R, C, X, W</td> |
| </tr> |
| <tr class="row-odd"><td><strong>library_path</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the server path to your ImageMagick or NetPBM library. If you use |
| either of those libraries you must supply the path.</td> |
| <td>R, C, X |
| R, C, S, W</td> |
| </tr> |
| <tr class="row-even"><td><strong>source_image</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the source image name/path. The path must be a relative or absolute |
| server path, not a URL.</td> |
| <td> </td> |
| </tr> |
| <tr class="row-odd"><td><strong>dynamic_output</strong></td> |
| <td>FALSE</td> |
| <td>TRUE/FALSE (boolean)</td> |
| <td>Determines whether the new image file should be written to disk or |
| generated dynamically. Note: If you choose the dynamic setting, only one |
| image can be shown at a time, and it can’t be positioned on the page. It |
| simply outputs the raw image dynamically to your browser, along with |
| image headers.</td> |
| <td>R, C, X, W</td> |
| </tr> |
| <tr class="row-even"><td><strong>file_permissions</strong></td> |
| <td>0644</td> |
| <td>(integer)</td> |
| <td>File system permissions to apply on the resulting image file, |
| writing it to the disk. WARNING: Use octal integer notation!</td> |
| <td>R, C, X, W</td> |
| </tr> |
| <tr class="row-odd"><td><strong>quality</strong></td> |
| <td>90%</td> |
| <td>1 - 100%</td> |
| <td>Sets the quality of the image. The higher the quality the larger the |
| file size.</td> |
| <td>R, C, X, W</td> |
| </tr> |
| <tr class="row-even"><td><strong>new_image</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the destination image name/path. You’ll use this preference when |
| creating an image copy. The path must be a relative or absolute server |
| path, not a URL.</td> |
| <td>R, C, X, W</td> |
| </tr> |
| <tr class="row-odd"><td><strong>width</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the width you would like the image set to.</td> |
| <td>R, C</td> |
| </tr> |
| <tr class="row-even"><td><strong>height</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the height you would like the image set to.</td> |
| <td>R, C</td> |
| </tr> |
| <tr class="row-odd"><td><strong>create_thumb</strong></td> |
| <td>FALSE</td> |
| <td>TRUE/FALSE (boolean)</td> |
| <td>Tells the image processing function to create a thumb.</td> |
| <td>R</td> |
| </tr> |
| <tr class="row-even"><td><strong>thumb_marker</strong></td> |
| <td>_thumb</td> |
| <td>None</td> |
| <td>Specifies the thumbnail indicator. It will be inserted just before the |
| file extension, so mypic.jpg would become mypic_thumb.jpg</td> |
| <td>R</td> |
| </tr> |
| <tr class="row-odd"><td><strong>maintain_ratio</strong></td> |
| <td>TRUE</td> |
| <td>TRUE/FALSE (boolean)</td> |
| <td>Specifies whether to maintain the original aspect ratio when resizing or |
| use hard values.</td> |
| <td>R, C</td> |
| </tr> |
| <tr class="row-even"><td><strong>master_dim</strong></td> |
| <td>auto</td> |
| <td>auto, width, height</td> |
| <td>Specifies what to use as the master axis when resizing or creating |
| thumbs. For example, let’s say you want to resize an image to 100 X 75 |
| pixels. If the source image size does not allow perfect resizing to |
| those dimensions, this setting determines which axis should be used as |
| the hard value. “auto” sets the axis automatically based on whether the |
| image is taller than wider, or vice versa.</td> |
| <td>R</td> |
| </tr> |
| <tr class="row-odd"><td><strong>rotation_angle</strong></td> |
| <td>None</td> |
| <td>90, 180, 270, vrt, hor</td> |
| <td>Specifies the angle of rotation when rotating images. Note that PHP |
| rotates counter-clockwise, so a 90 degree rotation to the right must be |
| specified as 270.</td> |
| <td>X</td> |
| </tr> |
| <tr class="row-even"><td><strong>x_axis</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the X coordinate in pixels for image cropping. For example, a |
| setting of 30 will crop an image 30 pixels from the left.</td> |
| <td>C</td> |
| </tr> |
| <tr class="row-odd"><td><strong>y_axis</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the Y coordinate in pixels for image cropping. For example, a |
| setting of 30 will crop an image 30 pixels from the top.</td> |
| <td>C</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="setting-preferences-in-a-config-file"> |
| <h3><a class="toc-backref" href="#id5">Setting preferences in a config file</a><a class="headerlink" href="#setting-preferences-in-a-config-file" title="Permalink to this headline">¶</a></h3> |
| <p>If you prefer not to set preferences using the above method, you can |
| instead put them into a config file. Simply create a new file called |
| image_lib.php, add the $config array in that file. Then save the file |
| in <em>config/image_lib.php</em> and it will be used automatically. You will |
| NOT need to use the <code class="docutils literal"><span class="pre">$this->image_lib->initialize()</span></code> method if you save |
| your preferences in a config file.</p> |
| </div> |
| </div> |
| <div class="section" id="image-watermarking"> |
| <h2><a class="toc-backref" href="#id6">Image Watermarking</a><a class="headerlink" href="#image-watermarking" title="Permalink to this headline">¶</a></h2> |
| <p>The Watermarking feature requires the GD/GD2 library.</p> |
| <div class="section" id="two-types-of-watermarking"> |
| <h3><a class="toc-backref" href="#id7">Two Types of Watermarking</a><a class="headerlink" href="#two-types-of-watermarking" title="Permalink to this headline">¶</a></h3> |
| <p>There are two types of watermarking that you can use:</p> |
| <ul class="simple"> |
| <li><strong>Text</strong>: The watermark message will be generated using text, either |
| with a True Type font that you specify, or using the native text |
| output that the GD library supports. If you use the True Type version |
| your GD installation must be compiled with True Type support (most |
| are, but not all).</li> |
| <li><strong>Overlay</strong>: The watermark message will be generated by overlaying an |
| image (usually a transparent PNG or GIF) containing your watermark |
| over the source image.</li> |
| </ul> |
| </div> |
| <div class="section" id="watermarking-an-image"> |
| <span id="watermarking"></span><h3><a class="toc-backref" href="#id8">Watermarking an Image</a><a class="headerlink" href="#watermarking-an-image" title="Permalink to this headline">¶</a></h3> |
| <p>Just as with the other methods (resizing, cropping, and rotating) the |
| general process for watermarking involves setting the preferences |
| corresponding to the action you intend to perform, then calling the |
| watermark function. Here is an example:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_text'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'Copyright 2006 - John Doe'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_type'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'text'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_font_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'./system/fonts/texb.ttf'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_font_size'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'16'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_font_color'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'ffffff'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_vrt_alignment'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'bottom'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_hor_alignment'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'center'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'wm_padding'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'20'</span><span class="p">;</span> |
| |
| <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span> |
| |
| <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">watermark</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>The above example will use a 16 pixel True Type font to create the text |
| “Copyright 2006 - John Doe”. The watermark will be positioned at the |
| bottom/center of the image, 20 pixels from the bottom of the image.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">In order for the image class to be allowed to do any |
| processing, the image file must have “write” file permissions |
| For example, 777.</p> |
| </div> |
| </div> |
| <div class="section" id="watermarking-preferences"> |
| <h3><a class="toc-backref" href="#id9">Watermarking Preferences</a><a class="headerlink" href="#watermarking-preferences" title="Permalink to this headline">¶</a></h3> |
| <p>This table shows the preferences that are available for both types of |
| watermarking (text or overlay)</p> |
| <table border="1" class="docutils"> |
| <colgroup> |
| <col width="17%" /> |
| <col width="14%" /> |
| <col width="17%" /> |
| <col width="53%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr class="row-odd"><th class="head">Preference</th> |
| <th class="head">Default Value</th> |
| <th class="head">Options</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr class="row-even"><td><strong>wm_type</strong></td> |
| <td>text</td> |
| <td>text, overlay</td> |
| <td>Sets the type of watermarking that should be used.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>source_image</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>Sets the source image name/path. The path must be a relative or absolute |
| server path, not a URL.</td> |
| </tr> |
| <tr class="row-even"><td><strong>dynamic_output</strong></td> |
| <td>FALSE</td> |
| <td>TRUE/FALSE (boolean)</td> |
| <td>Determines whether the new image file should be written to disk or |
| generated dynamically. Note: If you choose the dynamic setting, only one |
| image can be shown at a time, and it can’t be positioned on the page. It |
| simply outputs the raw image dynamically to your browser, along with |
| image headers.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>quality</strong></td> |
| <td>90%</td> |
| <td>1 - 100%</td> |
| <td>Sets the quality of the image. The higher the quality the larger the |
| file size.</td> |
| </tr> |
| <tr class="row-even"><td><strong>wm_padding</strong></td> |
| <td>None</td> |
| <td>A number</td> |
| <td>The amount of padding, set in pixels, that will be applied to the |
| watermark to set it away from the edge of your images.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>wm_vrt_alignment</strong></td> |
| <td>bottom</td> |
| <td>top, middle, bottom</td> |
| <td>Sets the vertical alignment for the watermark image.</td> |
| </tr> |
| <tr class="row-even"><td><strong>wm_hor_alignment</strong></td> |
| <td>center</td> |
| <td>left, center, right</td> |
| <td>Sets the horizontal alignment for the watermark image.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>wm_hor_offset</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>You may specify a horizontal offset (in pixels) to apply to the |
| watermark position. The offset normally moves the watermark to the |
| right, except if you have your alignment set to “right” then your offset |
| value will move the watermark toward the left of the image.</td> |
| </tr> |
| <tr class="row-even"><td><strong>wm_vrt_offset</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>You may specify a vertical offset (in pixels) to apply to the watermark |
| position. The offset normally moves the watermark down, except if you |
| have your alignment set to “bottom” then your offset value will move the |
| watermark toward the top of the image.</td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="section" id="text-preferences"> |
| <h4><a class="toc-backref" href="#id10">Text Preferences</a><a class="headerlink" href="#text-preferences" title="Permalink to this headline">¶</a></h4> |
| <p>This table shows the preferences that are available for the text type of |
| watermarking.</p> |
| <table border="1" class="docutils"> |
| <colgroup> |
| <col width="17%" /> |
| <col width="14%" /> |
| <col width="14%" /> |
| <col width="55%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr class="row-odd"><th class="head">Preference</th> |
| <th class="head">Default Value</th> |
| <th class="head">Options</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr class="row-even"><td><strong>wm_text</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>The text you would like shown as the watermark. Typically this will be a |
| copyright notice.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>wm_font_path</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>The server path to the True Type Font you would like to use. If you do |
| not use this option, the native GD font will be used.</td> |
| </tr> |
| <tr class="row-even"><td><strong>wm_font_size</strong></td> |
| <td>16</td> |
| <td>None</td> |
| <td>The size of the text. Note: If you are not using the True Type option |
| above, the number is set using a range of 1 - 5. Otherwise, you can use |
| any valid pixel size for the font you’re using.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>wm_font_color</strong></td> |
| <td>ffffff</td> |
| <td>None</td> |
| <td>The font color, specified in hex. Both the full 6-length (ie, 993300) and |
| the short three character abbreviated version (ie, fff) are supported.</td> |
| </tr> |
| <tr class="row-even"><td><strong>wm_shadow_color</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>The color of the drop shadow, specified in hex. If you leave this blank |
| a drop shadow will not be used. Both the full 6-length (ie, 993300) and |
| the short three character abbreviated version (ie, fff) are supported.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>wm_shadow_distance</strong></td> |
| <td>3</td> |
| <td>None</td> |
| <td>The distance (in pixels) from the font that the drop shadow should |
| appear.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="overlay-preferences"> |
| <h4><a class="toc-backref" href="#id11">Overlay Preferences</a><a class="headerlink" href="#overlay-preferences" title="Permalink to this headline">¶</a></h4> |
| <p>This table shows the preferences that are available for the overlay type |
| of watermarking.</p> |
| <table border="1" class="docutils"> |
| <colgroup> |
| <col width="17%" /> |
| <col width="14%" /> |
| <col width="14%" /> |
| <col width="55%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr class="row-odd"><th class="head">Preference</th> |
| <th class="head">Default Value</th> |
| <th class="head">Options</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr class="row-even"><td><strong>wm_overlay_path</strong></td> |
| <td>None</td> |
| <td>None</td> |
| <td>The server path to the image you wish to use as your watermark. Required |
| only if you are using the overlay method.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>wm_opacity</strong></td> |
| <td>50</td> |
| <td>1 - 100</td> |
| <td>Image opacity. You may specify the opacity (i.e. transparency) of your |
| watermark image. This allows the watermark to be faint and not |
| completely obscure the details from the original image behind it. A 50% |
| opacity is typical.</td> |
| </tr> |
| <tr class="row-even"><td><strong>wm_x_transp</strong></td> |
| <td>4</td> |
| <td>A number</td> |
| <td>If your watermark image is a PNG or GIF image, you may specify a color |
| on the image to be “transparent”. This setting (along with the next) |
| will allow you to specify that color. This works by specifying the “X” |
| and “Y” coordinate pixel (measured from the upper left) within the image |
| that corresponds to a pixel representative of the color you want to be |
| transparent.</td> |
| </tr> |
| <tr class="row-odd"><td><strong>wm_y_transp</strong></td> |
| <td>4</td> |
| <td>A number</td> |
| <td>Along with the previous setting, this allows you to specify the |
| coordinate to a pixel representative of the color you want to be |
| transparent.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="class-reference"> |
| <h2><a class="toc-backref" href="#id12">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2> |
| <dl class="class"> |
| <dt id="CI_Image_lib"> |
| <em class="property">class </em><code class="descname">CI_Image_lib</code><a class="headerlink" href="#CI_Image_lib" title="Permalink to this definition">¶</a></dt> |
| <dd><dl class="method"> |
| <dt id="CI_Image_lib::initialize"> |
| <code class="descname">initialize</code><span class="sig-paren">(</span><span class="optional">[</span><em>$props = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::initialize" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$props</strong> (<em>array</em>) – Image processing preferences</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE in case of invalid settings</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>Initializes the class for processing an image.</p> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="CI_Image_lib::resize"> |
| <code class="descname">resize</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::resize" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>The image resizing method lets you resize the original image, create a |
| copy (with or without resizing), or create a thumbnail image.</p> |
| <p>For practical purposes there is no difference between creating a copy |
| and creating a thumbnail except a thumb will have the thumbnail marker |
| as part of the name (i.e. mypic_thumb.jpg).</p> |
| <p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this |
| method except these three: <em>rotation_angle</em>, <em>x_axis</em> and <em>y_axis</em>.</p> |
| <p><strong>Creating a Thumbnail</strong></p> |
| <p>The resizing method will create a thumbnail file (and preserve the |
| original) if you set this preference to TRUE:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'create_thumb'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>This single preference determines whether a thumbnail is created or not.</p> |
| <p><strong>Creating a Copy</strong></p> |
| <p>The resizing method will create a copy of the image file (and preserve |
| the original) if you set a path and/or a new filename using this |
| preference:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'new_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/new_image.jpg'</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>Notes regarding this preference:</p> |
| <ul class="simple"> |
| <li>If only the new image name is specified it will be placed in the same |
| folder as the original</li> |
| <li>If only the path is specified, the new image will be placed in the |
| destination with the same name as the original.</li> |
| <li>If both the path and image name are specified it will placed in its |
| own destination and given the new name.</li> |
| </ul> |
| <p><strong>Resizing the Original Image</strong></p> |
| <p>If neither of the two preferences listed above (create_thumb, and |
| new_image) are used, the resizing method will instead target the |
| original image for processing.</p> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="CI_Image_lib::crop"> |
| <code class="descname">crop</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::crop" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>The cropping method works nearly identically to the resizing function |
| except it requires that you set preferences for the X and Y axis (in |
| pixels) specifying where to crop, like this:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'x_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'y_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">40</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this |
| method except these: <em>rotation_angle</em>, <em>create_thumb</em> and <em>new_image</em>.</p> |
| <p>Here’s an example showing how you might crop an image:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'image_library'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'imagemagick'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'library_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/usr/X11R6/bin/'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'x_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'y_axis'</span><span class="p">]</span> <span class="o">=</span> <span class="mi">60</span><span class="p">;</span> |
| |
| <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span> |
| |
| <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">crop</span><span class="p">())</span> |
| <span class="p">{</span> |
| <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Without a visual interface it is difficult to crop images, so this |
| method is not very useful unless you intend to build such an |
| interface. That’s exactly what we did using for the photo gallery module |
| in ExpressionEngine, the CMS we develop. We added a JavaScript UI that |
| lets the cropping area be selected.</p> |
| </div> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="CI_Image_lib::rotate"> |
| <code class="descname">rotate</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::rotate" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>The image rotation method requires that the angle of rotation be set |
| via its preference:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'rotation_angle'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'90'</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>There are 5 rotation options:</p> |
| <ol class="arabic simple"> |
| <li>90 - rotates counter-clockwise by 90 degrees.</li> |
| <li>180 - rotates counter-clockwise by 180 degrees.</li> |
| <li>270 - rotates counter-clockwise by 270 degrees.</li> |
| <li>hor - flips the image horizontally.</li> |
| <li>vrt - flips the image vertically.</li> |
| </ol> |
| <p>Here’s an example showing how you might rotate an image:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'image_library'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'netpbm'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'library_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/usr/bin/'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'source_image'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'/path/to/image/mypic.jpg'</span><span class="p">;</span> |
| <span class="nv">$config</span><span class="p">[</span><span class="s1">'rotation_angle'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'hor'</span><span class="p">;</span> |
| |
| <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span> |
| |
| <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">rotate</span><span class="p">())</span> |
| <span class="p">{</span> |
| <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="CI_Image_lib::watermark"> |
| <code class="descname">watermark</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::watermark" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>Creates a watermark over an image, please refer to the <a class="reference internal" href="#watermarking"><span class="std std-ref">Watermarking an Image</span></a> |
| section for more info.</p> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="CI_Image_lib::clear"> |
| <code class="descname">clear</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::clear" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>The clear method resets all of the values used when processing an |
| image. You will want to call this if you are processing images in a |
| loop.</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">clear</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="CI_Image_lib::display_errors"> |
| <code class="descname">display_errors</code><span class="sig-paren">(</span><span class="optional">[</span><em>$open = '<p></em><span class="optional">[</span>, <em>$close = '</p>'</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::display_errors" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$open</strong> (<em>string</em>) – Error message opening tag</li> |
| <li><strong>$close</strong> (<em>string</em>) – Error message closing tag</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Error messages</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>Returns all detected errors formatted as a string.</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">image_lib</span><span class="o">-></span><span class="na">display_errors</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
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