[Bf-vfx] Blender's colour pipeline

[Ton Roosendaal]

Hi,

After Matt's easy to understand summary I'd propose to follow that and  
keep it as simple as he's outlining for now. First target is to get a  
working method in Blender we can maintain well. If that's a clean and  
clear system, everything people would require later on would be  
possible to add as well.

Based on work and feedback done sofar, I'd suggest to choose  
OpenColorIO as first candidate for our color management. I'm confident  
we can do that in ways without creating unwanted dependencies for the  
future.

-Ton-

------------------------------------------------------------------------
Ton Roosendaal  Blender Foundation   ton at blender.org    www.blender.org
Blender Institute   Entrepotdok 57A  1018AD Amsterdam   The Netherlands

On 18 Jul, 2011, at 16:51, Troy Sobotka wrote:

>
> On Jul 18, 2011 7:03 AM, "Xavier Thomas" <xavier.thomas. 
> 1980 at gmail.com> wrote:
>
> > - Wich CMS to uses? Apparently only lcms2 and OpenColorIO can  
> handle properly 32bit flat imagery. OpenColorIO seems to be the  
> preferred choice because it is oriented CG/Vfx and tightened to  
> OpenImageIO which might make his way into blender (Cycles). However  
> some people where disappointed that OpenColorIO does not handle the  
> full ICC 4.2 spec. Personally I think it is not necessary and people  
> making graphics for printing (CMJK but often still images and not  
> animation) should do the CG in blender linear and the color  
> correction/composting in a program more intended for the purpose  
> (Gimp, Photoshop, ...)
>
> The problem is that OCIO, due to the workflow at SPI, does not have  
> a characterization transformation from ICC.
>
> ICC transforms are needed as it is likely 95% of Blender's audience  
> would be using a calibration and characterization system that works  
> with them. OCIO's LUT to ICC conversion I believe uses LCMS as a  
> dependency to accomplish this.
>
> There has been a GSOC project that issued a pull request for ICC  
> integration. See https://github.com/imageworks/OpenColorIO/pull/87
>
> So the bottom line is that currently, the question of CMS is  
> answered - both are needed. If and when OCIO integrates ICC  
> transforms, the dependency on LCMS2 will still be required.
>
> With respect,
> TJS
>
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