197 lines
8.6 KiB
Groff
197 lines
8.6 KiB
Groff
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<title>filter() | reference | Processing.js</title>
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<a href="http://processingjs.org/"><img src="../images/header.png" width="177" height="42"></a>
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<span class="tagline">a port of the Processing Visualization Language</span>
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<div class="span11">
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>filter()</h3></td>
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</tr>
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<tr class="">
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<th scope="row">Examples</th>
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<td><div class="example"><img src="filter_threshold.jpg" alt="example pic" /><pre class="margin">// @pjs preload must be used to preload the image
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/* @pjs preload="topanga.jpg"; */
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PImage b;
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b = loadImage("topanga.jpg");
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image(b, 0, 0);
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filter(THRESHOLD);</pre></div>
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<div class="example"><img src="filter_gray.jpg" alt="example pic" /><pre class="margin">// @pjs preload must be used to preload the image
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/* @pjs preload="topanga.jpg"; */
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PImage b;
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b = loadImage("topanga.jpg");
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image(b, 0, 0);
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filter(GRAY);</pre></div>
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<div class="example"><img src="filter_invert.jpg" alt="example pic" /><pre class="margin">// @pjs preload must be used to preload the image
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/* @pjs preload="topanga.jpg"; */
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PImage b;
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b = loadImage("topanga.jpg");
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image(b, 0, 0);
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filter(INVERT);
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save("filter_invert.tif");</pre></div>
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<div class="example"><img src="filter_posterize.jpg" alt="example pic" /><pre class="margin">// @pjs preload must be used to preload the image
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/* @pjs preload="topanga.jpg"; */
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PImage b;
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b = loadImage("topanga.jpg");
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image(b, 0, 0);
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filter(GRAY);
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filter(POSTERIZE, 4);</pre></div>
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<div class="example"><img src="filter_blur.jpg" alt="example pic" /><pre class="margin">// @pjs preload must be used to preload the image
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/* @pjs preload="topanga.jpg"; */
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PImage b;
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b = loadImage("topanga.jpg");
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image(b, 0, 0);
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filter(BLUR, 6);</pre></div>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Description</th>
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<td><p>Filters an image as defined by one of the following modes:</p>
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<p>THRESHOLD - converts the image to black and white pixels depending if they are above or below the threshold defined by the level parameter.
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The level must be between 0.0 (black) and 1.0(white). If no level is specified, 0.5 is used.</p>
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<p>GRAY - converts any colors in the image to grayscale equivalents</p>
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<p>INVERT - sets each pixel to its inverse value</p>
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<p>POSTERIZE - limits each channel of the image to the number of colors specified as the level parameter</p>
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<p>BLUR - executes a Guassian blur with the level parameter specifying the extent of the blurring.
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If no level parameter is used, the blur is equivalent to Guassian blur of radius 1.</p>
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<p>OPAQUE - sets the alpha channel to entirely opaque.</p>
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<p>ERODE - reduces the light areas with the amount defined by the level parameter.</p>
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<p>DILATE - increases the light areas with the amount defined by the level parameter</p></td>
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</tr>
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<tr class="">
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<th scope="row">Syntax</th>
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<td><pre>filter(<kbd>MODE</kbd>)</pre><br />
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<pre>filter(<kbd>MODE</kbd>,<kbd>srcImg</kbd>)</pre></td>
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</tr>
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<tr class="">
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<th scope="row">Parameters</th>
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<td>
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<table cellpadding="0" cellspacing="0" border="0">
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<tr class="">
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<th scope="row">MODE</th>
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<td>Either THRESHOLD, GRAY, INVERT, POSTERIZE, BLUR, OPAQUE, ERODE, or DILATE</td>
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</tr>
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<tr class="">
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<th scope="row">param</th>
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<td>int or float in the range from 0 to 1</td>
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</tr>
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</table>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Returns</th>
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<td>None</td>
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</tr>
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<tr class="">
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<th scope="row">Usage</th>
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<td>Web & Application</td>
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</tr>
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</table>
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<div class="cclicense">
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<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
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<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/2.0/">
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<h3><a href="http://processingjs.org/download/">Downloads</a></h3>
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<li><a href="http://processingjs.org/articles/jsQuickStart.html">Quick Start - JavaScript Developer</a></li>
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<li><a href="http://processingjs.org/articles/PomaxGuide.html">Pomax's Guide to processing-js</a></li>
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Processing is an open visualization language developed by
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<a href="http://benfry.com/">Ben Fry</a> & <a href="http://reas.com/">Casey Reas</a>,
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and originally ported to Javascript by
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<a href="http://ejohn.org/blog/processingjs/">John Resig</a>.
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