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    <p>If you are going to be manipulating every multiple pixels you could call <a href="http://developer.android.com/reference/android/graphics/Bitmap.html#getPixels%28int%5B%5D,%20int,%20int,%20int,%20int,%20int,%20int%29" rel="nofollow">getPixels()</a> and <a href="http://developer.android.com/reference/android/graphics/Bitmap.html#setPixels%28int%5B%5D,%20int,%20int,%20int,%20int,%20int,%20int%29" rel="nofollow">setPixels()</a> to get them all at once. This will prevent additional method calls and memory references in your loop.</p> <p>Another thing you could do is do the pixel addition with bitwise or instead of the helper methods. Preventing method calls should increase efficiency:</p> <pre><code>public static void applyAlpha(Bitmap b, Bitmap bAlpha) { int w = b.getWidth(); int h = b.getHeight(); int[] colorPixels = new int[w*h]; int[] alphaPixels = new int[w*h]; b.getPixels(colorPixels, 0, w, 0, 0, w, h); bAlpha.getPixels(alphaPixels, 0, w, 0, 0, w, h); for(int j = 0; j &lt; colorPixels.length;j++){ colorPixels[j] = alphaPixels[j] | (0x00FFFFFF &amp; colorPixels[j]); } b.setPixels(colorPixels, 0, w, 0, 0, w, h); } </code></pre> <p>That being said the process you are trying to undertake is fairly simple, I can't imagine these will provide a huge performance boost. From this point the only suggestion I can provide would be to goto a native implementation with the <a href="http://developer.android.com/tools/sdk/ndk/index.html" rel="nofollow">NDK</a>.</p> <p><strong>EDIT:</strong> Also since a Bitmap doesn't have to be mutable to use <code>getPixels()</code> or <code>getPixel()</code> you can get the alpha bitmap with <a href="http://developer.android.com/reference/android/graphics/BitmapFactory.html#decodeResource%28android.content.res.Resources,%20int%29" rel="nofollow">BitmapFactory.decodeResource()</a>:</p> <pre><code>Bitmap ba = BitmapFactory.decodeResource(a.getResources(), alphaImgId); </code></pre>
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    1. COWow! I didn't expect to get such a perfect answer! I don't know which part of your answer made the difference, but the game levels start up perceptibly faster. I haven't timed the difference, but I'm thinking you took it from a 3 or 4 second startup down to a 1 or 2 second startup. Thanks!
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    2. COInteresting, I was not expecting a major improvement so I'd be curious which part did the most. I think it's the use of `getPixels()` because it is implemented natively. That or possibly because the loop runs without any method calls the JIT compiler can perform more optimizations on it. If I get the time later I'll test it and try and figure it out.
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    3. COWell given there is definitely some wonkyness happening with the optimization I don't think I'll be able to determine which contributed to the change the most, but it spawned an interesting disscussion here: http://stackoverflow.com/questions/12240472/why-does-adding-an-if-statement-inside-a-loop-slow-it-down-so-drastically
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