D25209.1734741870.diff
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	diff --git a/src/applications/files/builtin/PhabricatorFilesComposeAvatarBuiltinFile.php b/src/applications/files/builtin/PhabricatorFilesComposeAvatarBuiltinFile.php
	--- a/src/applications/files/builtin/PhabricatorFilesComposeAvatarBuiltinFile.php
	+++ b/src/applications/files/builtin/PhabricatorFilesComposeAvatarBuiltinFile.php
	@@ -183,12 +183,21 @@
	'image/png');
	}

	+ /**
	+ * Convert a color from RGBA to a value usable in PHP-GD.
	+ * Each RGB color should be expressed as an integer from 0 to 255.
	+ * The Alpha Channel should be expressed as a float from 0 to 1.
	+ * @param array $rgba array( int Red, int Green, int Blue, float Alpha )
	+ * @return int
	+ */
	private static function rgba2gd($rgba) {
	+ // When working with a truecolor image, we can use bitwise operations
	+ // https://www.php.net/manual/en/function.imagecolorallocate.php#49168
	$r = $rgba[0];
	$g = $rgba[1];
	$b = $rgba[2];
	$a = $rgba[3];
	- $a = (1 - $a) * 255;
	+ $a = round(((1 - $a) * 255), 0);
	return ($a << 24) \| ($r << 16) \| ($g << 8) \| $b;
	}