adds imagemagick section

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Ashley Blewer 2018-03-29 11:46:02 -04:00
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<a href="#ocr"><div class="contents-list">Use OCR</div></a> <a href="#ocr"><div class="contents-list">Use OCR</div></a>
<a href="#perceptual-similarity"><div class="contents-list">Compare similarity of videos</div></a> <a href="#perceptual-similarity"><div class="contents-list">Compare similarity of videos</div></a>
<a href="#other"><div class="contents-list">Something else</div></a> <a href="#other"><div class="contents-list">Something else</div></a>
<a href="#similar-tools"><div class="contents-list">Similar tools: tips & tricks</div></a>
<a href="#imagemagick"><div class="contents-list">ImageMagick</div></a>
</nav> </nav>
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<h2 id="similar-tools">Similar tools: tips & tricks 🎩🐰</h2>
<div class="well">
<p>This section introduces and explains the usage of some additional command line tools similar to FFmpeg for use in digital preservation workflows (and beyond!).</p>
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<h2 id="imagemagick">ImageMagick</h2>
<!-- About ImageMagick -->
<label class="recipe" for="im-basics">About ImageMagick</label>
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<h3>About ImageMagick</h3>
<p>ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files.</p>
<p>It's official website can be found <a href="https://www.imagemagick.org/script/index.php">here</a>.</p>
<p>Another great resource with lots of supplemental explanations of filters is available at <a href="http://www.fmwconcepts.com/imagemagick/index.php">Fred's ImageMagick Scripts</a>.</p>
<p>Unlike many other command line tools, ImageMagick isn't summoned by calling its name. Rather, ImageMagick installs links to several more specific commands: <code>convert</code>, <code>montage</code>, and <code>mogrify</code>, to name a few.</p>
<p class="link"></p>
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<!-- Resize to width -->
<label class="recipe" for="im_resize">Resizes image to specific pixel width</label>
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<h3>Resize to width</h3>
<p><code>convert <i>input_file.ext</i> -resize 750 <i>output_file.ext</i></code></p>
<p>This script will also convert the file format, if the output has a different file extension than the input.</p>
<dl>
<dt>convert</dt><dd>starts the command</dd>
<dt>-i <i>input_file.ext</i></dt><dd>path and name of the input file</dd>
<dt>-resize 750</dt><dd>resizes the image to 750 pixels wide, retaining aspect ratio</dd>
<dt><i>output_file.ext</i></dt><dd>path and name of the output file</dd>
</dl>
<p class="link"></p>
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<!-- Create thumbnails -->
<label class="recipe" for="im_thumbs">Create thumbnails of images</label>
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<h3>Create thumbnails</h3>
<p>Creates thumbnails for all files in a folder and saves them in that folder.</p>
<p><code>mogrify -resize 80x80 -format jpg -quality 75 -path thumbs *.jpg</code></p>
<dl>
<dt>montage</dt><dd>starts the command</dd>
<dt>-resize 80x80</dt><dd>resizes copies of original images to 80x80 pixels</dd>
<dt>-format jpg</dt><dd>reformats original images to jpg</dd>
<dt>-quality 75</dt><dd>sets quality to 75 (out of 100), adding light compression to smaller files</dd>
<dt>-path thumbs</dt><dd>specifies where to save the thumbnails -- this goes to a folder within the active folder called "thumbs".<br>
Note: You will have to make this folder if it doesn't already exist.</dd>
<dt><i>*.jpg</i></dt><dd>The astericks acts as a "wildcard" to be applied to every file in the directory.</dd>
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<p class="link"></p>
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<!-- Create grid of images -->
<label class="recipe" for="im_grid">Creates grid of images from text file</label>
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<h3>Create grid of images</h3>
<p><code>montage @list.txt -tile 6x12 -geometry +0+0 <i>output_grid.jpg</i></code></p>
<dl>
<dt>montage</dt><dd>starts the command</dd>
<dt>@list.txt</dt><dd>path and name of a text file containing a list of filenames, one per each line</dd>
<dt>-tile 6x12</dt><dd>specifies the dimensions of the proposed grid (6 images wide, 12 images long)</dd>
<dt>-geometry +0+0</dt><dd>specifies to include no spacing around any of the tiles; they will be flush against each other</dd>
<dt><i>output_grid.jpg</i></dt><dd>path and name of the output file</dd>
</dl>
<p class="link"></p>
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