D7604.diff
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	diff --git a/src/applications/files/PhabricatorImageTransformer.php b/src/applications/files/PhabricatorImageTransformer.php
	--- a/src/applications/files/PhabricatorImageTransformer.php
	+++ b/src/applications/files/PhabricatorImageTransformer.php
	@@ -294,6 +294,15 @@
	$lower_text,
	$mime_type) {
	$img = imagecreatefromstring($data);
	+
	+ // Some PNGs have color palettes, and allocating the dark border color
	+ // fails and gives us whatever's first in the color table. Copy the image
	+ // to a fresh truecolor canvas before working with it.
	+
	+ $truecolor = imagecreatetruecolor(imagesx($img), imagesy($img));
	+ imagecopy($truecolor, $img, 0, 0, 0, 0, imagesx($img), imagesy($img));
	+ $img = $truecolor;
	+
	$phabricator_root = dirname(phutil_get_library_root('phabricator'));
	$font_root = $phabricator_root.'/resources/font/';
	$font_path = $font_root.'tuffy.ttf';