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    <p>The simple solution is to scale the image down before you apply the blur filter. Here are some examples:</p> <p><strong>Original image:</strong></p> <p><img src="https://i.stack.imgur.com/DkIzu.jpg" alt="Photo of a cat (public domain: Longhair_Tabby_JaJa.jpg from Wikimedia Commons)"></p> <p><strong>20× Gaussian Blur (2.160 seconds):</strong></p> <pre><code>{ $start = microtime(true); for ($x=0; $x&lt;20; $x++) { imagefilter($image, IMG_FILTER_GAUSSIAN_BLUR); } $end = microtime(true); $howlong = $end - $start; } </code></pre> <p><img src="https://i.stack.imgur.com/8szk3.jpg" alt="Result of applying Gaussian blur filter 20 times"></p> <p><strong>Combination of scaling and Gaussian blur (0.237 seconds):</strong></p> <pre><code>{ $start = microtime(true); /* Scale by 25% and apply Gaussian blur */ $s_img1 = imagecreatetruecolor(160,120); imagecopyresampled($s_img1, $image, 0, 0, 0, 0, 160, 120, 640, 480); imagefilter($s_img1, IMG_FILTER_GAUSSIAN_BLUR); /* Scale result by 200% and blur again */ $s_img2 = imagecreatetruecolor(320,240); imagecopyresampled($s_img2, $s_img1, 0, 0, 0, 0, 320, 240, 160, 120); imagedestroy($s_img1); imagefilter($s_img2, IMG_FILTER_GAUSSIAN_BLUR); /* Scale result back to original size and blur one more time */ imagecopyresampled($image, $s_img2, 0, 0, 0, 0, 640, 480, 320, 240); imagedestroy($s_img2); imagefilter($image, IMG_FILTER_GAUSSIAN_BLUR); $end = microtime(true); $howlong = $end - $start; } </code></pre> <p><img src="https://i.stack.imgur.com/96ppi.jpg" alt="Result of applying a combination of image scaling and Gaussian blur"></p>
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    1. POPHP implementation of stackblur algorithm available?
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    1. COOnly problem with that is when you scale it back up the pixels become apparent. I can see them fairly clearly in your example image. If the OP is okay with the "grungy" look than of course that's fine, but it's not such a great solution if they need to maintain the PPI.
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      1. USGordonM
    2. CO@GordonM I see what you mean. I've replace the third image with one that uses 6 iterations of Gaussian blur after scaling back to the original dimensions. For comparison, the original image (2 iterations) is here: [i.stack.imgur.com/XqIMi.jpg](http://i.stack.imgur.com/XqIMi.jpg)
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    3. CO@GordonM I've found a better way of doing it — if the image is scaled back to its original size in stages, then it only needs one pass of the blur filter at each stage.
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