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    <p>After couple of hours of testing and kicking my head against the wall, I think I've found solution. Problem was about allocating transparent color using <code>imagecolorallocate()</code>. I did not get it at first sight. It was totally wrong approach. However, <code>imagecolorallocatealpha()</code> has helped me alot.</p> <p>Also, alpha blending must be off before saving alpha channel on working layer. However, it must be done right after creating blank true-color image, like</p> <pre><code> $im = imagecreatetruecolor($w, $h); $alphacolor = imagecolorallocatealpha($img, $r, $g, $b, 127); imagealphablending($im, false); imagesavealpha($im, true); </code></pre> <p>This code is a key for getting smooth corners in transparent area after resize-down.</p> <p>After all, I've wrote this function</p> <pre><code> function imageCreateCorners($sourceImageFile, $radius) { # function body } </code></pre> <p>I've tested it with couple of images and it returned image with smooth corners for every bg color.</p> <pre><code> imagepng(imageCreateCorners('jan_vesely_and_james_gist.jpg', 9), 'test.png'); </code></pre> <h2>Output</h2> <p><strong>Original image</strong></p> <p><img src="https://i.stack.imgur.com/a140b.jpg" alt="enter image description here"></p> <h2>IN BROWSER (Same png file 'test.png')</h2> <p><img src="https://i.stack.imgur.com/19epz.gif" alt="enter image description here"></p> <p>It finally returns fully transparent alpha channel so you can use that image on every background you want.</p> <p>I almost forgot to post function code :)</p> <h2>function imageCreateCorners($sourceImageFile, $radius)</h2> <pre><code> function imageCreateCorners($sourceImageFile, $radius) { # test source image if (file_exists($sourceImageFile)) { $res = is_array($info = getimagesize($sourceImageFile)); } else $res = false; # open image if ($res) { $w = $info[0]; $h = $info[1]; switch ($info['mime']) { case 'image/jpeg': $src = imagecreatefromjpeg($sourceImageFile); break; case 'image/gif': $src = imagecreatefromgif($sourceImageFile); break; case 'image/png': $src = imagecreatefrompng($sourceImageFile); break; default: $res = false; } } # create corners if ($res) { $q = 10; # change this if you want $radius *= $q; # find unique color do { $r = rand(0, 255); $g = rand(0, 255); $b = rand(0, 255); } while (imagecolorexact($src, $r, $g, $b) &lt; 0); $nw = $w*$q; $nh = $h*$q; $img = imagecreatetruecolor($nw, $nh); $alphacolor = imagecolorallocatealpha($img, $r, $g, $b, 127); imagealphablending($img, false); imagesavealpha($img, true); imagefilledrectangle($img, 0, 0, $nw, $nh, $alphacolor); imagefill($img, 0, 0, $alphacolor); imagecopyresampled($img, $src, 0, 0, 0, 0, $nw, $nh, $w, $h); imagearc($img, $radius-1, $radius-1, $radius*2, $radius*2, 180, 270, $alphacolor); imagefilltoborder($img, 0, 0, $alphacolor, $alphacolor); imagearc($img, $nw-$radius, $radius-1, $radius*2, $radius*2, 270, 0, $alphacolor); imagefilltoborder($img, $nw-1, 0, $alphacolor, $alphacolor); imagearc($img, $radius-1, $nh-$radius, $radius*2, $radius*2, 90, 180, $alphacolor); imagefilltoborder($img, 0, $nh-1, $alphacolor, $alphacolor); imagearc($img, $nw-$radius, $nh-$radius, $radius*2, $radius*2, 0, 90, $alphacolor); imagefilltoborder($img, $nw-1, $nh-1, $alphacolor, $alphacolor); imagealphablending($img, true); imagecolortransparent($img, $alphacolor); # resize image down $dest = imagecreatetruecolor($w, $h); imagealphablending($dest, false); imagesavealpha($dest, true); imagefilledrectangle($dest, 0, 0, $w, $h, $alphacolor); imagecopyresampled($dest, $img, 0, 0, 0, 0, $w, $h, $nw, $nh); # output image $res = $dest; imagedestroy($src); imagedestroy($img); } return $res; } </code></pre> <p>Function returns <strong>GD object</strong> or <strong>false</strong>.</p> <hr> <p>Function works with solid JPEG, GIF and PNG images. Also, it works great with transparent PNGs and GIFs.</p>
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    1. CO@Wh1T3h4Ck5 thank you for your answer. 1). I have to admit that fixing the background color is not an option... I mean images may be used over div's filled with gradient background, so I still need transparent corners. 3). Yes, I'm scaling down `$magnified` to `$dest` and exporting the latter. I've tried `imagecolortransparent($dest, $colorcode);` but the point is that I need to remove `$colorcode` **before** scaling the image down in order to keep corners clear. 4). I used that for _test_ purposes – just to export `$magnified` and to see what it looks like.
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    2. CO5). Yes, I have `header();` at export stage with content-type and cache control settings. For rounded images I send image/png headers. I can use `$q=5;` instead of 10 in order to save memory, that's fine, but I need this script to work as expected first. 6). Are corners in your example transparent or with fixed background? I can see black "noise" on the guy's hand, did you remove `$colorcode` after scaling down?
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    3. CO@Wh1T3h4Ck5 yeah that's because [`imagecolortransparent($dest, $colorcode);` removes `$colorcode` from the already scaled down image](http://i.imgur.com/qwLLF.png), and keeps semi-transparent parts of it. I need to make `$colorcode` transparent when the image is still big and rounded borders are sharp.
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