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    <p>Here is a implementation of the <em>doSomethingWithTHESEChannels</em> method as per your design :</p> <pre><code> private int doSomethingWithTHESEChannels(int i, int channels) { if (Channel.NONE == channels) { return i; } int a, r, g, b; a = (i &amp; Channel.ALPHA) &gt;&gt; 24; r = (i &amp; Channel.RED) &gt;&gt; 16; g = (i &amp; Channel.GREEN) &gt;&gt; 8; b = i &amp; Channel.BLUE; int cur = channels &amp; Channel.ALL; if (cur == Channel.ALL) { System.out.println("all found"); a = transform(a); r = transform(r); g = transform(g); b = transform(b); } else { cur = channels &amp; Channel.ALPHA; if (cur == Channel.ALPHA) { System.out.println("alpha found"); a = transform(a); } cur = channels &amp; Channel.RED; if (cur == Channel.RED) { System.out.println("red found"); r = transform(r); } cur = channels &amp; Channel.GREEN; if (cur == Channel.GREEN) { System.out.println("green found"); g = transform(g); } cur = channels &amp; Channel.BLUE; if (cur == Channel.BLUE) { System.out.println("blue found"); b = transform(b); } } return (a &lt;&lt; 24 | r &lt;&lt; 16 | g &lt;&lt; 8 | b); } </code></pre> <p>The transform method is the operation to be applied to a channel. The <em>Sysouts</em> are just for testing purposes. You may change the type of a,r,g,b variables to byte with proper type-castings if needed. </p> <p>However, I suggest you to move the above channel detection blocks(if conditions) to the <em>getProcessedPixels</em> method itself. Then you can pass the entire <em>pixels</em> array to a transform method. This way you will eliminate the redundant condition checks for each pixel. If you need hint on this, just leave a reply, I will update the answer.</p>
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    1. POHow to selectively apply processing algorithm to certain color channel(s) in Java
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    1. COWow, thanks! Your code seems right and makes sense, I'll try it.
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    2. COI think you're right about moving if blocks to the processing method, it might gives me some performance boost. Great suggestion!
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    3. COmy pleasure! Your lib'll be free? I would like to use.
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