[FFmpeg-user] xyz to rgb conversion

[Carl Eugen Hoyos]

SK Cinema <senthil <at> real-image.com> writes:

> > Please provide a tiff sample containing xyz.
> 
> Here's a sample of a tiff containing X'Y'Z'. Google 
> Viewer seems unable to display this tiff correctly so 
> please download and view locally.
> https://docs.google.com/file/d/0B1U1rZVj1f7pbXdlZkFucjhTQk0/edit?usp=sharing
> 
> Ironically, I made this tiff with an older ffmpeg build 
> (2013-04-18) which did not yet have the XYZ-RGB conversion!

I may misunderstand but this sounds to me as if no software 
would be able to recognize this file as XYZ or do I miss 
something?

[...]

As said elsewhere, please try to explain what is wrong with 
the conversion by FFmpeg? I suspect (maybe I am wrong) that 
no developer know why other coefficients may be needed.
(In the sense of: Which usecases need other coefficients 
and which ones.)

> But again, this is defeated by the XYZ-RGB conversion 
> happening prior to the 3D LUT being applied, which is 
> not the desired result.

This sounds as if it could be fixed but it would need (for 
me, probably not for other developers) a proper report.

Please fix your quoting, Carl Eugen