[FFmpeg-trac] #11182(swscale:closed): yuvtestsrc and yuv444p->rgba->yuv444p conversion result in huge difference

[FFmpeg]

#11182: yuvtestsrc and yuv444p->rgba->yuv444p conversion result in huge difference
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             Reporter:  Andrew-R     |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:  swscale
              Version:  unspecified  |               Resolution:  invalid
             Keywords:  colorspace   |               Blocked By:
  color_primaries                    |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Balling):

 >Actually the existence of the limited-range thing much derives from the
 analog legacy

 No, it really does not, reference black was for example 7.5 IRE, 53.57 mV,
 {{{
 https://en.wikipedia.org/wiki/IRE_(unit)
 }}}


 YUV was using different matrix and some analog TV was not even using any
 matrix, it was linear RGB (only SECAM IV used linear RGB) or non-linear
 R'G'B'. Besides, 16-235 was not even a thing intially. They were planning
 to set black and white level at different values.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11182#comment:19>
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