Edit report at https://bugs.php.net/bug.php?id=65148&edit=1
ID: 65148
Updated by: kalle@php.net
Reported by: imprec at gmail dot com
Summary: imagerotate may alter image dimensions
-Status: Assigned
+Status: Open
Type: Bug
Package: GD related
PHP Version: 5.5+
-Assigned To: pajoye
+Assigned To:
Block user comment: N
Private report: N
Previous Comments:
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[2016-09-05 11:47:32] cmb@php.net
This has apparently been fixed as of libgd-2.2.2[1], but not yet
been integrated to PHP's bundled libgd.
@pajoye If this issue is considered to be bug, the patch should
probably applied to PHP-5.6+.
[1] <https://github.com/libgd/libgd/commit/6267414d>
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[2016-04-16 15:52:59] pajoye@php.net
The cause was slightly different. The calculation of the transformed image dimensions were partially
wrong.
If you can try this patch, that should fix your issue:
https://gist.github.com/pierrejoye/59d72385ed1888cf8894a7ed437235ae
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[2016-04-11 05:38:08] pajoye@php.net
It seems to be only for the default interpolation method, IMG_BILINEAR_FIXED.
Adding:
imagesetinterpolation($image, IMG_BICUBIC);
before calling imagerotate shows the correct result. IMG_BICUBIC_FIXED for example works well too.
I have to check if other are affected but my feeling is that only the bilinear fixed point
implementation fails.
If you have time, you can also try it. The various interpolation methods are available here:
http://php.net/manual/en/function.imagesetinterpolation.php
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[2016-04-09 10:51:38] plunk at hushmail dot com
The top and left of the image is actually clipped. This problem appears at all rotations:
<?php
$image = imagecreatetruecolor(500,250);
$bg = imagecolorallocatealpha($image, 255, 255, 127, 127);
$black = imagecolorallocatealpha($image, 0, 0, 0, 0);
$blue = imagecolorallocatealpha($image, 0, 0, 255, 0);
$red = imagecolorallocatealpha($image, 255, 0, 0, 0);
imagesavealpha($image, true);
imagealphablending($image, false);
ImageFill($image, 0, 0 , $bg);
imagerectangle($image,0,0,imagesx($image)-1,imagesy($image)-1,$black);
imagerectangle($image,1,1,imagesx($image)-2,imagesy($image)-2,$blue);
imagerectangle($image,2,2,imagesx($image)-3,imagesy($image)-3,$red);
imagepng($image,'dump1.png');
echo '<img src="dump1.png" /><p>'.(imagesx($image).' x
'.imagesy($image)).'</p>';
$image = imagerotate($image,0.1,$bg);
imagepng($image,'dump2.png');
echo '<img src="dump2.png" /><p>'.(imagesx($image).' x
'.imagesy($image)).'</p>';
?>
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[2015-07-12 21:30:14] cmb@php.net
Related To: Bug #66882
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