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Bug #73281 imagescale(…, IMG_BILINEAR_FIXED) can cause black border
Submitted: 2016-10-10 11:07 UTC Modified: 2019-01-10 15:30 UTC
Votes:2
Avg. Score:3.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:1 (50.0%)
Same OS:0 (0.0%)
From: cmb@php.net Assigned: cmb (profile)
Status: Closed Package: GD related
PHP Version: master-Git-2016-10-10 (Git) OS: *
Private report: No CVE-ID: None
 [2016-10-10 11:07 UTC] cmb@php.net
Description:
------------
When upscaling a completely white image with the interpolation
method IMG_BILINEAR_FIXED, the resulting image has a black border
at the bottom.

This has been reported against upstream libgd[1], but as PHP's
bundled libgd is also affected, I'm forwarding.

[1] <https://github.com/libgd/libgd/issues/329>


Test script:
---------------
<?php

$src = imagecreatetruecolor(100, 100);
$expected = 0xffffff;
imagefilledrectangle($src, 0,0, 99,99, $expected);
$dst = imagescale($src, 200, 200, IMG_BILINEAR_FIXED);
printf("color: %x", imagecolorat($dst, 199, 199));


Expected result:
----------------
color: ffffff


Actual result:
--------------
color: 5f7f7f7f

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2019-01-10 15:29 UTC] cmb@php.net
Automatic comment on behalf of cmbecker69@gmx.de
Revision: http://git.php.net/?p=php-src.git;a=commit;h=6b4cdbaade1b077e8f0eceecb0e07921fed00aff
Log: Fix #73281: imagescale(…, IMG_BILINEAR_FIXED) can cause black border
 [2019-01-10 15:29 UTC] cmb@php.net
-Status: Open +Status: Closed
 [2019-01-10 15:30 UTC] cmb@php.net
-Assigned To: +Assigned To: cmb
 
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