Bug #73281 [NEW]: imagescale(â¦, IMG_BILINEAR_FIXED) can cause black border
From: cmb
Operating system: *
PHP version: master-Git-2016-10-10 (Git)
Package: GD related
Bug Type: Bug
Bug description:imagescale(â¦, IMG_BILINEAR_FIXED) can cause black border
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
--
Edit bug report at https://bugs.php.net/bug.php?id=73281&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73281&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73281&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73281&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=73281&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=73281&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=73281&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=73281&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=73281&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=73281&r=support
Expected behavior: https://bugs.php.net/fix.php?id=73281&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=73281&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=73281&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=73281&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73281&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=73281&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=73281&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=73281&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=73281&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=73281&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=73281&r=mysqlcfg
Thread (2 messages)
- cmb@php.net