Image transparency not preserved when merging two images in PHP

Question

When using examples from other posts to try and merge one PNG that has transparent parts on it with another non-transparent PNG, the foreground PNGs transparency is lost and defaults to white.

The code so far:

$width = 349;
$height = 250;

$base_image = imagecreatefrompng($_GET['bg']);
$top_image = imagecreatefrompng($_GET['fg']);
$merged_image = "merged.png";

imagesavealpha($top_image, true);
imagealphablending($top_image, true);

imagecopy($base_image, $top_image, 0, 0, 0, 0, $width, $height);
imagepng($base_image, $merged_image);

Can anyone suggest where I may be going wrong?

Coming out like this Should look like this

score 0 · Answer 1 · edited May 23 '17 at 12:07

0

Copy from Can PNG image transparency be preserved when using PHP's GDlib imagecopyresampled?

Codes should be like this:

imagesavealpha($base_image, true);
imagealphablending($base_image, false);

edited May 23 '17 at 12:07

Community

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1

answered Jun 28 '12 at 13:04

silverfox

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Thanks, didnt seem to solve however. Have found solution at any rate. – Gga Jun 28 '12 at 13:30
Glad to hear that. maybe you can post your solution as an answer to help others. – silverfox Jun 28 '12 at 13:33

score 0 · Answer 2 · answered Jun 28 '12 at 13:31

0

 $image = imagecreatefrompng($_GET['bg']);
 $frame = imagecreatefrompng($_GET['fg']);

 imagealphablending($frame,true);
 imagecopymerge($image, $frame, 0, 0, 0, 0, 0, 100, 100);

 # Save the image to a file
 imagepng($image, 'file-xyz.png');

answered Jun 28 '12 at 13:31

Gga

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Image transparency not preserved when merging two images in PHP

2 Answers2