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    <p>A friend and I were trying to do this a while back for a project, and found writing an inline method that does this in ActionScript to be incredibly slow. You have to scan each pixel and do a computation against it, but doing it with PixelBender proved to be lightning fast (if you can use Flash 10, otherwise your stuck with slow AS).</p> <p>The pixel bender code looks like:</p> <pre><code>input image4 src; output float4 dst; // How close of a match you want parameter float threshold &lt; minValue: 0.0; maxValue: 1.0; defaultValue: 0.4; &gt;; // Color you are matching against. parameter float3 color &lt; defaultValue: float3(1.0, 1.0, 1.0); &gt;; void evaluatePixel() { float4 current = sampleNearest(src, outCoord()); dst = float4((distance(current.rgb, color) &lt; threshold) ? 0.0 : current); } </code></pre> <p>If you need to do it in AS you can use something like:</p> <pre><code>function threshold(source:BitmapData, dest:BitmapData, color:uint, threshold:Number) { dest.lock(); var x:uint, y:uint; for (y = 0; y &lt; source.height; y++) { for (x = 0; x &lt; source.width; x++) { var c1:uint = source.getPixel(x, y); var c2:uint = color; var rx:uint = Math.abs(((c1 &amp; 0xff0000) &gt;&gt; 16) - ((c2 &amp; 0xff0000) &gt;&gt; 16)); var gx:uint = Math.abs(((c1 &amp; 0xff00) &gt;&gt; 8) - ((c2 &amp; 0xff00) &gt;&gt; 8)); var bx:uint = Math.abs((c1 &amp; 0xff) - (c2 &amp; 0xff)); var dist = Math.sqrt(rx*rx + gx*gx + bx*bx); if (dist &lt;= threshold) dest.setPixel(x, y, 0x00ffffff); else dest.setPixel(x, y, c1); } } dest.unlock(); } </code></pre>
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    1. COWhat are c1 and c2 in your actionscript example? color?
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    2. COYes, sorry I moved this code from somewhere else and had to modify it a bit. It should be fixed now.
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    3. COAlso note there was a missing pair of lines after dest.setPixel
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