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The color resolution is expected in bits 4-6 of the packed fields byte of the logical screen descriptor (byte 10 of the GIF data stream), according to the specification[1], section 18. [1] <https://www.w3.org/Graphics/GIF/spec-gif89a.txt>
21 lines
458 B
PHP
21 lines
458 B
PHP
--TEST--
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Bug #79615 (Wrong GIF header written in GD GIFEncode)
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--SKIPIF--
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<?php
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if (!extension_loaded('gd')) die('skip gd extension not available');
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?>
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--FILE--
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<?php
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$im = imagecreate(3, 3); // 3x3, 9 colors, 4 bits per pixel
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for ($x = 0; $x < 3; $x++) {
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for ($y = 0; $y < 3; $y++) {
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imagesetpixel($im, $x, $y, imagecolorallocate($im, $x, $y, 0));
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}
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}
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ob_start();
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imagegif($im);
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echo decbin(ord(ob_get_clean()[0xA]));
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?>
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--EXPECT--
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10110011
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