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    <p>This function works perfectly for me for resizing jpg's and transparent (or not) gif's:</p> <pre><code>function resizeImage($originalImage, $toWidth, $toHeight, $isJPG) { // Get the original geometry and calculate scales list($width, $height) = getimagesize($originalImage); $xscale = $width / $toWidth; $yscale = $height / $toHeight; // Recalculate new size with default ratio if ($yscale &gt; $xscale) { $new_width = round($width * (1 / $yscale)); $new_height = round($height * (1 / $yscale)); } else { $new_width = round($width * (1 / $xscale)); $new_height = round($height * (1 / $xscale)); } // Resize the original image if ($isJPG) { $imageResized = imagecreatetruecolor($new_width, $new_height); $imageTmp = imagecreatefromjpeg($originalImage); imagecopyresampled($imageResized, $imageTmp, 0, 0, 0, 0, $new_width, $new_height, $width, $height); } else { //$imageResized = imagecreatetruecolor($new_width, $new_height); //$imageTmp = imagecreatefromgif ($originalImage); //imagecopyresampled($imageResized, $imageTmp, 0, 0, 0, 0, $new_width, $new_height, $width, $height); # what follows is for resizing a gif, transparent or not # http://ru2.php.net/imagecopyresampled # load/create images $imageTmp = imagecreatefromgif($originalImage); $imageResized = imagecreatetruecolor($new_width, $new_height); imagealphablending($imageResized, false); # get and reallocate transparency-color $transindex = imagecolortransparent($imageTmp); if ($transindex &gt;= 0) { $transcol = imagecolorsforindex($imageTmp, $transindex); $transindex = imagecolorallocatealpha( $imageResized, $transcol['red'], $transcol['green'], $transcol['blue'], 127 ); imagefill($imageResized, 0, 0, $transindex); } # resample imagecopyresampled($imageResized, $imageTmp, 0, 0, 0, 0, $new_width, $new_height, $width, $height); # restore transparency if ($transindex &gt;= 0) { imagecolortransparent($imageResized, $transindex); for ($y = 0; $y &lt; $new_height; ++$y) { for ($x = 0; $x &lt; $new_width; ++$x) { if (((imagecolorat($imageResized, $x, $y) &gt;&gt; 24) &amp; 0x7F) &gt;= 100) { imagesetpixel( $imageResized, $x, $y, $transindex ); } } } } # save GIF imagetruecolortopalette($imageResized, true, 255); imagesavealpha($imageResized, false); } return $imageResized; } </code></pre> <p>The original function is from PhpToys 1.0, and the part that works with transparent .gifs comes from <a href="http://www.php.net/manual/en/function.imagecopyresampled.php#89987" rel="nofollow noreferrer">this PHP docs comment</a>.</p>
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