[FFmpeg-trac] #2684(swscale:new): Black becomes dark gray when converting rgb24 to gray

FFmpeg trac at avcodec.org
Tue Jun 18 16:26:24 CEST 2013


#2684: Black becomes dark gray when converting rgb24 to gray
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             Reporter:  b_jonas     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by b_jonas):

 Further experiments reveal that the output of the rgb24 to gray conversion
 seems similar to the Y plane of the yuv444p pixel format (as opposed to
 the yuvj444p pixel format).  This makes repeated roundtrip conversions
 from gray to rgb24 to gray very inconsistent: doing the roundtrip four
 times reduces the contrast of the grayscale image by over 40%.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2684#comment:3>
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