Description:
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GD version: bundled (2.0.34 compatible)

Using a negative $color parameter for imagettftext() does not produce antialiased text if the image is created with imagecreate() (as opposed to imagecreatetruecolor()) and the text color is the first color allocated.

I have not looked into this but I suppose the first color recieves an index of 0, thus a test for <0 always fails and antialiasing is never used. Using a negative color index is a really awful hack. imagettftext() should receive an additional parameter instead.


Test script:
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<?php

$im = imagecreate(210, 50);
$background_color = imagecolorallocate($im, 0, 0, 0);
$text_color = imagecolorallocate($im, 255, 255, 255);
imagefilledrectangle($im, 0, 0, 209, 49, $background_color);
imagettftext($im, 20, 0, 10, 20, -$text_color, "arial.ttf", "Antialiasing");
imagetruecolortopalette($im, FALSE, 255);
imagepng($im, "as_intended.png");
imagedestroy($im);

$im = imagecreate(210, 50);
$text_color = imagecolorallocate($im, 255, 255, 255);
$background_color = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, 209, 49, $background_color);
imagettftext($im, 20, 0, 10, 20, -$text_color, "arial.ttf", "Antialiasing");
imagetruecolortopalette($im, FALSE, 255);
imagepng($im, "not_as_intended.png");
imagedestroy($im);

?> 

Expected result:
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The script should produce two identical PNG images with not antialiased text.

Actual result:
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The image as_intended.png shows the expected result whereas not_as_intended.png shows antialiased text where the text should not be antialiased.