File: /var/www/html/process3D.php
<?php
$filename = "abstract.png";
$image_s = imagecreatefromstring(file_get_contents($filename));
$width = imagesx($image_s);
$height = imagesy($image_s);
$newwidth = 500;
$newheight = 500;
$image = imagecreatetruecolor($newwidth, $newheight);
imagealphablending($image, true);
imagecopyresampled($image, $image_s, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
//create masking
$mask = imagecreatetruecolor($newwidth, $newheight);
$transparent = imagecolorallocate($mask, 255, 0, 0);
imagecolortransparent($mask,$transparent);
imagefilledellipse($mask, $newwidth/2, $newheight/2, $newwidth, $newheight, $transparent);
$red = imagecolorallocate($mask, 0, 0, 0);
imagecopymerge($image, $mask, 0, 0, 0, 0, $newwidth, $newheight, 100);
imagecolortransparent($image,$red);
imagefill($image, 0, 0, $red);
$merged_image = imagecreatetruecolor(300, 300);
imagealphablending($merged_image, false);
imagesavealpha($merged_image, true);
imagecopy($merged_image, $image1, 0, 0, 0, 0, 300, 300);
// after first time of "imagecopy" change "imagealphablending"
imagealphablending($merged_image, **true**);
imagecopy($merged_image, $image2, 0, 0, 0, 0, 300, 300);
//output, save and free memory
header('Content-type: image/png');
imagepng($image);
imagepng($image);
imagedestroy($image);
imagedestroy($mask);