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copied!<p>Seems like you've already accepted an answer but I'm gonna still post mine.</p> <p>First of all, you really don't need to use <strong>100%</strong> in quality, a <strong>90%</strong> or <strong>85%</strong> value will do just fine while decreasing your processing time and image size (if you don't believe me just run some tests).</p> <p>I've also done some benchmarks with <a href="http://cambodianlivingarts.co.uk/downloads/ChildrenoftheKhmer_edinburgh1.jpg" rel="noreferrer">this image</a> and a custom <code>JPEG()</code> function, <strong>first test case:</strong></p> <pre><code>JPEG('./original.jpg', null, '1024*774', './output/large.jpg'); JPEG('./original.jpg', null, '500*378', './output/medium.jpg'); JPEG('./original.jpg', null, '240*161', './output/small.jpg'); JPEG('./original.jpg', null, '100*76', './output/thumb.jpg'); JPEG('./original.jpg', null, '50*38', './output/small_thumb.jpg'); JPEG('./original.jpg', null, '75*75', './output/square.jpg'); </code></pre> <p>This takes an average of 60 seconds on my slow <strong>slow</strong> computer.</p> <hr> <p><strong>Second test case</strong>:</p> <pre><code>JPEG('./original.jpg', null, '1024*774', './output/large.jpg'); JPEG('./output/large.jpg', null, '500*378', './output/medium.jpg'); JPEG('./output/medium.jpg', null, '240*161', './output/small.jpg'); JPEG('./output/medium.jpg', null, '100*76', './output/thumb.jpg'); JPEG('./output/medium.jpg', null, '50*38', './output/small_thumb.jpg'); JPEG('./output/medium.jpg', null, '75*75', './output/square.jpg'); </code></pre> <p>This one takes "only" 16 seconds (my computer is really slow ATM <strong>:P</strong>), almost 4 times faster.</p> <hr> <p><strong>Here is the <code>JPEG()</code> function in case you want to make your own benchmarks:</strong></p> <pre><code>function JPEG($source, $crop = null, $scale = null, $destination = null) { $source = ImageCreateFromJPEG($source); if (is_resource($source) === true) { $size = array(ImageSX($source), ImageSY($source)); if (isset($crop) === true) { $crop = array_filter(explode('/', $crop), 'is_numeric'); if (count($crop) == 2) { $crop = array($size[0] / $size[1], $crop[0] / $crop[1]); if ($crop[0] > $crop[1]) { $size[0] = $size[1] * $crop[1]; } else if ($crop[0] < $crop[1]) { $size[1] = $size[0] / $crop[1]; } $crop = array(ImageSX($source) - $size[0], ImageSY($source) - $size[1]); } else { $crop = array(0, 0); } } else { $crop = array(0, 0); } if (isset($scale) === true) { $scale = array_filter(explode('*', $scale), 'is_numeric'); if (count($scale) >= 1) { if (empty($scale[0]) === true) { $scale[0] = $scale[1] * $size[0] / $size[1]; } else if (empty($scale[1]) === true) { $scale[1] = $scale[0] * $size[1] / $size[0]; } } else { $scale = array($size[0], $size[1]); } } else { $scale = array($size[0], $size[1]); } $result = ImageCreateTrueColor($scale[0], $scale[1]); if (is_resource($result) === true) { if (ImageCopyResampled($result, $source, 0, 0, $crop[0] / 2, $crop[1] / 2, $scale[0], $scale[1], $size[0], $size[1]) === true) { return ImageJPEG($result, $destination, 90); } } } return false; } </code></pre>

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