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| 6 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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| 8 | <title>Module: FileColumn::Magick</title> |
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| 49 | <div id="classHeader"> |
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| 50 | <table class="header-table"> |
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| 51 | <tr class="top-aligned-row"> |
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| 52 | <td><strong>Module</strong></td> |
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| 53 | <td class="class-name-in-header">FileColumn::Magick</td> |
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| 54 | </tr> |
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| 55 | <tr class="top-aligned-row"> |
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| 56 | <td><strong>In:</strong></td> |
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| 57 | <td> |
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| 58 | <a href="../../files/lib/magick_file_column_rb.html"> |
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| 59 | lib/magick_file_column.rb |
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| 60 | </a> |
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| 61 | <br /> |
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| 73 | <div id="contextContent"> |
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| 74 | |
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| 75 | <div id="description"> |
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| 76 | <p> |
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| 77 | If you are using file_column to upload images, you can directly process the |
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| 78 | images with RMagick, a ruby extension for accessing the popular imagemagick |
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| 79 | libraries. You can find more information about RMagick at <a |
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| 80 | href="http://rmagick.rubyforge.org">rmagick.rubyforge.org</a>. |
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| 81 | </p> |
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| 82 | <p> |
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| 83 | You can control what to do by adding a <tt>:magick</tt> option to your |
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| 84 | options hash. All operations are performed immediately after a new file is |
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| 85 | assigned to the file_column attribute. |
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| 86 | </p> |
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| 87 | <p> |
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| 88 | To resize the uploaded image according to an imagemagick geometry string, |
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| 89 | just use the <tt>:geometry</tt> option: |
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| 90 | </p> |
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| 91 | <pre> |
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| 92 | file_column :image, :magick => {:geometry => "800x600>"} |
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| 93 | </pre> |
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| 94 | <p> |
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| 95 | You can also create additional versions of your image, for example |
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| 96 | thumb-nails, like this: |
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| 97 | </p> |
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| 98 | <pre> |
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| 99 | file_column :image, :magick => {:versions => |
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| 100 | { "thumb" => "50x50", "medium" => "640x480>" } |
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| 101 | } |
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| 102 | </pre> |
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| 103 | <p> |
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| 104 | These versions can later be accessed via file_column’s |
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| 105 | <em>suffix</em> mechanism. So if the uploaded image was named |
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| 106 | "vancouver.jpg", you can access the additional versions like |
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| 107 | this: |
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| 108 | </p> |
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| 109 | <pre> |
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| 110 | o.image("thumb") # produces ".../vancouver-thumb.jpg" |
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| 111 | o.image_relative_path("medium") # produces ".../vancouver-medium.jpg" |
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| 112 | </pre> |
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| 113 | <p> |
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| 114 | The same mechanism can be used in the <tt>url_for_file_column</tt> helper: |
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| 115 | </p> |
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| 116 | <pre> |
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| 117 | <%= url_for_file_column "entry", "image", "thumb" %> |
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| 118 | </pre> |
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| 119 | <p> |
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| 120 | <b>Note:</b> You‘ll need the rmagick extension installed as a gem in |
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| 121 | order to use file_column’s rmagick integration. |
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| 122 | </p> |
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