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    <p>Matt, </p> <p>If you make your png with the oval white fill on black background instead of black fill with transparent background the following function does it.</p> <pre><code>&lt;?php // Load source and mask $source = imagecreatefrompng( '1.png' ); $mask = imagecreatefrompng( '2.png' ); // Apply mask to source imagealphamask( $source, $mask ); // Output header( "Content-type: image/png"); imagepng( $source ); function imagealphamask( &amp;$picture, $mask ) { // Get sizes and set up new picture $xSize = imagesx( $picture ); $ySize = imagesy( $picture ); $newPicture = imagecreatetruecolor( $xSize, $ySize ); imagesavealpha( $newPicture, true ); imagefill( $newPicture, 0, 0, imagecolorallocatealpha( $newPicture, 0, 0, 0, 127 ) ); // Resize mask if necessary if( $xSize != imagesx( $mask ) || $ySize != imagesy( $mask ) ) { $tempPic = imagecreatetruecolor( $xSize, $ySize ); imagecopyresampled( $tempPic, $mask, 0, 0, 0, 0, $xSize, $ySize, imagesx( $mask ), imagesy( $mask ) ); imagedestroy( $mask ); $mask = $tempPic; } // Perform pixel-based alpha map application for( $x = 0; $x &lt; $xSize; $x++ ) { for( $y = 0; $y &lt; $ySize; $y++ ) { $alpha = imagecolorsforindex( $mask, imagecolorat( $mask, $x, $y ) ); $alpha = 127 - floor( $alpha[ 'red' ] / 2 ); $color = imagecolorsforindex( $picture, imagecolorat( $picture, $x, $y ) ); imagesetpixel( $newPicture, $x, $y, imagecolorallocatealpha( $newPicture, $color[ 'red' ], $color[ 'green' ], $color[ 'blue' ], $alpha ) ); } } // Copy back to original picture imagedestroy( $picture ); $picture = $newPicture; } ?&gt; </code></pre>
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    1. POPHP GD Use one image to mask another image, including transparency
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    1. COThank you, this is really helpful
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    2. COI know this post has been closed for some time, but what was the runtime looking like when you guys ran this script? It's taking on average 20 seconds or so...My source / mask images are 250 x 170px...is that about what you guys are getting?
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    3. CODisregard, not sure what I was doing wrong but it works great now :P Thanks guys!
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