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    <p>This is what I use for my game. This is the compilation of various part found on various articles on websites. Credits goes to the original author from the @see links. Note that a lot more can be done with color matrices. Including inverting, etc...</p> <pre><code>public class ColorFilterGenerator { /** * Creates a HUE ajustment ColorFilter * @see http://groups.google.com/group/android-developers/browse_thread/thread/9e215c83c3819953 * @see http://gskinner.com/blog/archives/2007/12/colormatrix_cla.html * @param value degrees to shift the hue. * @return */ public static ColorFilter adjustHue( float value ) { ColorMatrix cm = new ColorMatrix(); adjustHue(cm, value); return new ColorMatrixColorFilter(cm); } /** * @see http://groups.google.com/group/android-developers/browse_thread/thread/9e215c83c3819953 * @see http://gskinner.com/blog/archives/2007/12/colormatrix_cla.html * @param cm * @param value */ public static void adjustHue(ColorMatrix cm, float value) { value = cleanValue(value, 180f) / 180f * (float) Math.PI; if (value == 0) { return; } float cosVal = (float) Math.cos(value); float sinVal = (float) Math.sin(value); float lumR = 0.213f; float lumG = 0.715f; float lumB = 0.072f; float[] mat = new float[] { lumR + cosVal * (1 - lumR) + sinVal * (-lumR), lumG + cosVal * (-lumG) + sinVal * (-lumG), lumB + cosVal * (-lumB) + sinVal * (1 - lumB), 0, 0, lumR + cosVal * (-lumR) + sinVal * (0.143f), lumG + cosVal * (1 - lumG) + sinVal * (0.140f), lumB + cosVal * (-lumB) + sinVal * (-0.283f), 0, 0, lumR + cosVal * (-lumR) + sinVal * (-(1 - lumR)), lumG + cosVal * (-lumG) + sinVal * (lumG), lumB + cosVal * (1 - lumB) + sinVal * (lumB), 0, 0, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 0f, 0f, 1f }; cm.postConcat(new ColorMatrix(mat)); } protected static float cleanValue(float p_val, float p_limit) { return Math.min(p_limit, Math.max(-p_limit, p_val)); } } </code></pre> <p>To complete this I should add an example:</p> <pre><code>ImageView Sun = (ImageView)findViewById(R.id.sun); Sun.setColorFilter(ColorFilterGenerator.adjustHue(162)); // 162 degree rotation </code></pre>
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    1. COWow, thanks! I'm not going to pretend I understand exactly what's going on with those matrix values, but I'm curious, what does the `cleanValue()` method do?
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    2. COit makes sure it doesn't go out of bound and cause artifacts.
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    3. COThanks!! Works perfect!
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