Carl Eugen Hoyos e9c8a9aaa6 swscale/utils: Fix color range of gray16
Improves rgb -> gray16 conversion

Fixes Ticket3422

The pam and png output files look visually similar, in both cases the
dynamics increase to 0x0 -> 0xfffb.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 37c07d45290cf9cdad061cd5c2af94a2783ba847)
2014-03-19 03:14:39 +01:00
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