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Bug #30595 Imagecopyresampled function bug
Submitted: 2004-10-28 11:02 UTC Modified: 2004-11-19 13:16 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: lunter at interia dot pl Assigned: pajoye (profile)
Status: Not a bug Package: GD related
PHP Version: 5.0.2 OS: WinXP SP2
Private report: No CVE-ID: None
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 [2004-10-28 11:02 UTC] lunter at interia dot pl 
Description:
------------
Imagecopyresampled function bug:

Original image: Any one-color square.
After resized (reduce 1 pixel width and heihgt): Two colors square with noise !!!

Example with PHP code:
http://www.pc44.pl/goorol/ImagecopyresampledBug.zip

Reproduce code:
---------------
<?
 $im=imagecreatefrompng('original.png'); // 100x100 one-color square
 $re=imagecreatetruecolor(99,99); 
 imagecopyresampled($re,$im,0,0,0,0,99,99,imagesx($im),imagesy($im));
 imagepng($re,'resized.png');
?>

http://www.pc44.pl/goorol/ImagecopyresampledBug.zip

Expected result:
----------------
One-color 99x99 square.

Actual result:
--------------
Two-colors with NOISE 99x99 square.

Example with PHP code:
http://www.pc44.pl/goorol/ImagecopyresampledBug.zip

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 [2004-11-19 13:16 UTC] pajoye@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

imagecopyresampled uses a resampling using weight of each original pixels in the destination image. That means even by resizing by a ratio of 0.99, you will have part of the image that will differ, in your case the edges of your square.

--Pierre
 
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