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  1. PO
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    <p>Gaussian blur is expensive to do accurately. A much faster approximation can be done by just iteratively averaging the pixels. It's still expensive to blur the image a lot but you can redraw between each iteration to at least give instant feedback and a nice animation of the image blurring.</p> <pre><code>static void blurfast(Bitmap bmp, int radius) { int w = bmp.getWidth(); int h = bmp.getHeight(); int[] pix = new int[w * h]; bmp.getPixels(pix, 0, w, 0, 0, w, h); for(int r = radius; r &gt;= 1; r /= 2) { for(int i = r; i &lt; h - r; i++) { for(int j = r; j &lt; w - r; j++) { int tl = pix[(i - r) * w + j - r]; int tr = pix[(i - r) * w + j + r]; int tc = pix[(i - r) * w + j]; int bl = pix[(i + r) * w + j - r]; int br = pix[(i + r) * w + j + r]; int bc = pix[(i + r) * w + j]; int cl = pix[i * w + j - r]; int cr = pix[i * w + j + r]; pix[(i * w) + j] = 0xFF000000 | (((tl &amp; 0xFF) + (tr &amp; 0xFF) + (tc &amp; 0xFF) + (bl &amp; 0xFF) + (br &amp; 0xFF) + (bc &amp; 0xFF) + (cl &amp; 0xFF) + (cr &amp; 0xFF)) &gt;&gt; 3) &amp; 0xFF | (((tl &amp; 0xFF00) + (tr &amp; 0xFF00) + (tc &amp; 0xFF00) + (bl &amp; 0xFF00) + (br &amp; 0xFF00) + (bc &amp; 0xFF00) + (cl &amp; 0xFF00) + (cr &amp; 0xFF00)) &gt;&gt; 3) &amp; 0xFF00 | (((tl &amp; 0xFF0000) + (tr &amp; 0xFF0000) + (tc &amp; 0xFF0000) + (bl &amp; 0xFF0000) + (br &amp; 0xFF0000) + (bc &amp; 0xFF0000) + (cl &amp; 0xFF0000) + (cr &amp; 0xFF0000)) &gt;&gt; 3) &amp; 0xFF0000; } } } bmp.setPixels(pix, 0, w, 0, 0, w, h); } </code></pre>
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    1. POAndroid, Blur Bitmap instantly?
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    1. USgordy
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      1. VTUpMod
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    1. COThis code recalculates the same sums several times. If you want this kind of bluring see my answer.
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      1. USTobias Ritzau
    2. COthank you i shall check this out
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      1. USrennoDeniro
    3. COthis blurring doesn't work to the extent required,
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