[FFmpeg-trac] #1582(swscale:open): Banding/discoloration in darker gradients when converting to rgb24

[FFmpeg]

#1582: Banding/discoloration in darker gradients when converting to rgb24
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             Reporter:  y3kcjd5     |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Changes (by 11rcombs):

 * cc: rodger.combs@… (added)


Comment:

 Found this issue while working on some screenshot comparisons; figured I'd
 post 'em as another reproduction:
 rgb48 = frame extracted from H.264 High 10 video with -ss and -vframes 1
 rgb24 = same, but with -filter:v "format=rgb24"
 VLCSnap = snapshot of same frame using VLC (probably irrelevant)
 Preview = rgb48 frame downsampled to rgb24 using OSX's Preview.app (to
 show that it's possible to downsample this image without banding)
 rgb48 vs rgb24: http://screenshotcomparison.com/comparison/20164
 VLCSnap vs rgb24: http://screenshotcomparison.com/comparison/20165
 rgb24 vs Preview: http://screenshotcomparison.com/comparison/20166
 rgb48 vs Preview: http://screenshotcomparison.com/comparison/20167

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1582#comment:8>
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