[FFmpeg-trac] #3927(avcodec:closed): feature request: enable pix_fmt xyz12le / xyz12be for TIFF sequences

[FFmpeg]

#3927: feature request: enable pix_fmt xyz12le / xyz12be for TIFF sequences
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             Reporter:  maweber      |                    Owner:
                 Type:  enhancement  |                   Status:  closed
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  tif          |  needs_more_info
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by maweber):

 Hi cehoyos
 Sorry this got dusty, you did right in closing the thread,
 but it was a misunderstanding. I answered above my request was pointless.
 This is just as an info (I learned in the meantime):

 One can get into XYZ with a suitable LUT.
 I use this here for my intermediate LUTed tiffs:

 In the example I used the LUT previously on the $input with a source-to-
 target specific LUT.
 For example this one for sRGB-gamma2.1-to-XYZ-gamma-2.6 (ffmpeg can do
 that):
 https://www.dropbox.com/s/yn5k07hfew0r25d/srgb_2.10_to_XYZ.cube?dl=0

 The 12-bit tiff part (you'll notice the waste of bitdepth):
 ffmpeg -loglevel quiet -y -i "$input" -vframes 1 -c:v ppm -pix_fmt rgb48be
 -f image2pipe -threads 0 - | \
         /usr/bin/gm convert ppm:- -depth 12 \
         -endian msb -define quantum:format=unsigned -compress None \
         -define tiff:bits-per-sample=12 tif:$output
 gm is graphicsmagick

 best
 M

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Ticket URL: <https://trac.ffmpeg.org/ticket/3927#comment:7>
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