Transparency of PHP merged image not working

Question

I'm creating an image with imagecopymerge, but the image being overlaid on top, is a PNG but the transparent part is pure white. How do I enable transparency?

$image = imagecreatefromjpeg($this->getFile());

    $size = getimagesize($this->getFile());  

    $watermark = imagecreatefrompng('../watermark.png');
    $watermark_width = imagesx($watermark);  
    $watermark_height = imagesy($watermark);

    $dest_x = $size[0] - $watermark_width - 10;  

    $dest_y = $size[1] - $watermark_height - 5; 

    //die($watermark_width);

    $thumb_image = imagecreatetruecolor($this->getThumbWidth(), $this->getThumbHeight());

    imagealphablending($thumb_image,true);
    imagealphablending($image,true);

    imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 100);  

    imagecopyresampled( $thumb_image, $image, 0, 0, 0, 0, $this->getThumbResizeWidth(), $this->getThumbResizeHeight(), $this->getWidth(), $this->getHeight() );
    imagejpeg( $thumb_image, $this->getThumbDestination(), $this->getThumbQuality() );

    imagedestroy($thumb_image);
    imagedestroy($image);

score 1 · Accepted Answer · edited Jan 13 '13 at 21:00

1

So I FINALLY found a solution. It's using imagecopy().

Here is the article that nudged me in the right direction.

That took quite a few hours of research!

edited Jan 13 '13 at 21:00

kittycat

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answered Jan 11 '13 at 03:07

Adam

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score 0 · Answer 2 · edited May 23 '17 at 12:12

0

Use imagecolortransparent()

Read more here

EDIT: A better solution is here:

https://stackoverflow.com/a/313103/1533203

edited May 23 '17 at 12:12

Community

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answered Jan 10 '13 at 20:50

David Harris

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It appears that the function merely allows for either fully transparent or fully color, not partial opacity. – Adam Jan 10 '13 at 21:03
Then read this :) http://is.php.net/manual/en/function.imagecolorallocatealpha.php – David Harris Jan 13 '13 at 20:57

Transparency of PHP merged image not working

2 Answers2