1--TEST-- 2Bug #75124 (gdImageGrayScale() may produce colors) 3--EXTENSIONS-- 4gd 5--SKIPIF-- 6<?php 7if (!GD_BUNDLED && version_compare(GD_VERSION, '2.2.5', '<')) { 8 die('skip only for bundled libgd or external libgd >= 2.2.5'); 9} 10?> 11--FILE-- 12<?php 13$im = imagecreatefrompng(__DIR__ . '/bug75124.png'); 14var_dump(imageistruecolor($im)); 15imagefilter($im, IMG_FILTER_GRAYSCALE); 16for ($i = 0, $width = imagesx($im); $i < $width; $i ++) { 17 for ($j = 0, $height = imagesy($im); $j < $height; $j++) { 18 $color = imagecolorat($im, $i, $j); 19 $red = ($color >> 16) & 0xff; 20 $green = ($color >> 8) & 0xff; 21 $blue = $color & 0xff; 22 if ($red != $green || $green != $blue) { 23 echo "non grayscale pixel detected\n"; 24 break 2; 25 } 26 } 27} 28?> 29--EXPECT-- 30bool(true) 31
