[CREATE] Linear light workflow

Boudewijn Rempt boud at valdyas.org
Wed Mar 28 09:08:36 PDT 2012

On Wednesday 28 March 2012 Mar, Kai-Uwe Behrmann wrote:
> Andrew Chadwick <a.t.chadwick at gmail.com> schrieb:
> >On 27/03/12 19:24, Øyvind Kolås wrote:
> >Does this idea seem sensible to everyone? I assume sRGB and linearRGB
> >are going to be the only needed values and we shouldn't try to extend
> >it, particularly if it's to go into baseline[1]. If there are no
> >objections I'll go ahead and make the spec and schema tweaks.
> With that you specify quite some implementation details.
> You now have to decide if ORA requires implementations to handle 
> implicite colour conversions to normalise to the linear or sRGB like 
> gamma. With source images in wide gamut spaces that might mean, 
> to either render using floats or convert into a colour space big 
> enough to cover the source spaces. Otherwise saturated colours are 
> at risc to get lost.
> On the other hand it would be possible to to allow for user defined 
> blending spaces in some way like in PDF. But that way you preserve 
> complexity for rendering time.
> Imagine a image completely in gamma 1.8 and I think you get 
> what I mean.

I tested today in krita -- it's a little known thing that Krita supports a linear-light workflow perfectly well. Basically, it's a matter of using the right icc profile to define the working space and the example Andrew showed just works in Krita.

Wouldn't it be easier to just define the working space with a profile in openraster, and take it from there? 

I must admit that I probably still don't understand all the ins and outs.

Boudewijn Rempt
http://www.valdyas.org, http://www.krita.org, http://www.boudewijnrempt.nl

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