Im wondering if I'm doing something wrong, or if this is as good a result as im going to get. Both PNGs on the left are 95x111. The image of the robot has a 5px or so padding of transparent pixels around it, but it seems to be causing problems when they merge?
$avatar = imagecreatefrompng("../guy.png");
$borderImg = imagecreatefrompng("../frame.png");
imagealphablending( $borderImg, false );
imagesavealpha( $borderImg, true );
imagecopyresampled($avatar,$borderImg, 0, 0, 0, 0, 95, 111,95, 111);
imagepng($avatar, $newfilenameBig);
Ive tried every combo of imagealphablending and imagesavealpha I can think of. When I set $avatar to imagesavealpa= true, then it doesnt even show the image as all, just the frame. Doesn't that seem strange? Is this as far as i'm gonna get using PHP GD?
UPDATE: The desired result can be achieved when both images are created manually in PS using 24 bit mode. Is there a way to do this using imagecopy or similar?
Try the following code its working fine.
$width = 95; $height = 111; $base_image = imagecreatefrompng("../guy.png"); $top_image = imagecreatefrompng("../frame.png"); imagesavealpha($top_image, false); imagealphablending($top_image, false); imagecopy($base_image, $top_image, 0, 0, 0, 0, $width, $height); imagepng($base_image, "merged.png");
I think that Jaguar library which uses GD will help to do that easily:
for example to create what you want you need to use the overlay action which works with gif,png,jpeg and any supported format:
Note This action is super fast and is not pixel based and the overlay could be any supported format and the opacity will be saved
use Jaguar\Canvas,
Jaguar\Transformation;
$transformation = new Transformation(new Canvas('your robots'));
$transformation->overlay(new Canvas('your frame'))
->getCanvas()
->show();
来源:https://stackoverflow.com/questions/7574856/unusual-result-when-merging-two-transparent-images-in-php