Re: [PHP] GD - JPEG to PNG with transparency and color

At 12:16 PM -0400 5/6/08, Travis L. Font wrote:
>Following files:
>bg.png - Clear Transparent Image
>14416fed5d4f78.jpg - Normal Jpeg Image
>
>
>The Code:
>
>header('content-type: image/png'); 
>
>$watermark = imagecreatefromjpeg('14416fed5d4f78.jpg');
>
>$watermark_width = imagesx($watermark); 
>$watermark_height = imagesy($watermark); 
>
>$image = imagecreatetruecolor($watermark_width, $watermark_height); 
>$image = imagecreatefrompng('bg.png'); 
>
>$size = getimagesize('bg.png'); 
>
>$dest_x = $size[0] - $watermark_width - 5; 
>$dest_y = $size[1] - $watermark_height - 5; 
>
>imagecopymerge($image, $watermark, $dest_x, 
>$dest_y, 0, 0, $watermark_width, 
>$watermark_height, 100);
>
>imagepng($image);
>
>imagedestroy($image); 
>imagedestroy($watermark);
>
>
>The Problem:
>
>The code above works fine in sense of syntax! 
>bg.png acts as a transparent border for 
>14416fed5d4f78.jpg to keep the size of bg.png 
>and not the size of 14416fed5d4f78.jpg so it 
>doesn't blow up 14416fed5d4f78.jpg. However, the 
>image comes out black/white and has lost its 
>color!
>I looked all over Google and I've found nothing 
>so far that's functional to give the new created 
>png file the correct colors as the original 
>14416fed5d4f78.jpg. I figure that I'm missing 
>some small elements to the process of creating 
>the pngŠ
>Anyone have any ideas, pointers, advice, or 
>correct solution to make this possible?

Travis:

Try this:

$original=imagecreatefromjpeg("mydog.jpg");
$watermark=imagecreatefrompng("copyright.png");

$osx=imagesx($original);
$osy=imagesy($original);
$wsx=imagesx($watermark);
$wsy=imagesy($watermark);

imagecopy($original, $watermark, ($osx-$wsx)/2, 
($osy-$wsy)/2, 0, 0, $wsx, $wsy); //center

imagepng($original, "trans.png");

The code works here:

http://webbytedd.com/b/watermark/

Cheers,

tedd

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