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--- libpng.txt.orig 2005-09-13 00:42:43.000000000 +0200
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+++ libpng.txt 2005-09-13 00:44:10.000000000 +0200
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gray = (rw*red + gw*green + bw*blue)/65536;
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The default values approximate those recommended in the Charles
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-Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
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-Copyright (c) 1998-01-04 Charles Poynton <poynton at inforamp.net>
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+<http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html>
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+Copyright (c) 2002-12-16 Charles Poynton <poynton at poynton.com>
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Y = 0.212671 * R + 0.715160 * G + 0.072169 * B