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imagecreatefrompng() fatal errors

Posted on 2006-05-08
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Last Modified: 2012-05-05
I can't say that I've worked extensively with the GD library, but I've been toying with some of those functions tonight, and unfortunately the imagecreatefrompng() function throws back a fatal warning:

Warning: imagecreatefrompng(): '/home/gmyers/public_html/test.png' is not a valid PNG file in /home/gmyers/public_html/tester.php on line 2

I'm pretty sure it is *valid*; I just created it in Photoshop CS. Although I'm not sure in this case what PHP's definition is valid is. I also tested the function getimagesize() on the same image, which worked successfully; it gave me the correct width × height. The image has a transparent background, probably has a lot of colors, and may have some alpha blending (I used the polygon lasso tool in Photoshop to cut out the background; I believe that may cause the edges to have partial transparency.) I know that those properties may be causing the problem with PHP, and if that's the case, is there some way to preserve transparency/alpha channels? If that's not the case, what did I screw up?

Code I'm using:

<?php
$old_image = imagecreatefrompng('/home/gmyers/public_html/test.png');
$new_image = imagecreatetruecolor(400, 150);

imagecopy($new_image, $old_image, 0, 0, 130, 0, 100, 100);

header('Content-type: image/png');
imagepng($new_image);
imagedestroy($new_image);
?>
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Question by:soapergem
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3 Comments
 
LVL 40

Accepted Solution

by:
Richard Quadling earned 2000 total points
ID: 16637470
Can you give a URL to the image?
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LVL 6

Author Comment

by:soapergem
ID: 16637544
Heh...don't I feel silly now. It turns out that when I uploaded the image, my FTP client encountered an error and only partially uploaded it. That would be the problem! I've re-uploaded, and it works fine now. Aside from that, I'm a generous guy, and I think I would have been beating myself over the head for quite awhile longer had you not said that comment, so I'm going to give you all the points. Thanks!
0
 
LVL 40

Expert Comment

by:Richard Quadling
ID: 16637553
Ha!

The next thing I would have done is downloaded the image and then tried running the script myself.

But as soon as the URL failed ...

Thanks anyway.
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