[FFmpeg-trac] #2097(avfilter:new): Let Gradfun output an undithered image of higher bit depth.

[FFmpeg]

#2097: Let Gradfun output an undithered image of higher bit depth.
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             Reporter:  sun       |                     Type:  enhancement
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  unspecified
             Keywords:  gradfun   |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 For my understanding the gradfun filter takes an 8 bit per channel image,
 converts it to a higher bit depth and then smoothes gradiation steps with
 little color delta to achieve an image of virtually higher bit depth. Then
 the data is converted to 8 bit again and dithered.

 As, beneath viewing movies, an other very useful application of gradfun is
 to convert 8 bit material from cameras (which produce banding) to higher
 depth intermediate codecs (like DNxHD 185x which uses 10 bit) for video
 editing tasks, it would be helpful if the filter could also skip the
 dithering and output an image with higher depth directly for such
 purposes.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2097>
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