[RFC wayland-protocols v2 1/1] Add the color-management protocol

Pekka Paalanen ppaalanen at gmail.com
Wed Mar 6 12:28:30 UTC 2019

On Wed, 6 Mar 2019 13:44:39 +1100
Graeme Gill <graeme2 at argyllcms.com> wrote:

> Pekka Paalanen wrote:
> > Sebastian's protocol proposal includes render intent from applications.
> > Conversion of client content to the blending space should ideally be
> > lossless, so the render intent in that step should be irrelevant if I
> > understand right. How to deal with render intent when converting from
> > blending space to output space is not clear to me, since different
> > windows may have different intents. Using the window's intent for the
> > window's pixels works only if the pixel in the framebuffer comes from
> > exactly one window and not more.  
> Conceptually the conversion from source space to destination
> is a single step, with a single intent. So conceptually any
> conversions after this for the purposes of blending don't
> have to pay any regard to intent - it's already applied.
> Blending could convert from the device space back
> to XYZ, blend, and then convert back to device space.
> It would use whatever intent is appropriate for blending
> purposes, i.e. probably Relative Colorimetric.
> But I doubt this is the best approach. (see my previous
> post on blending.)

Hi Graeme,

yes, you're right. I wrote that before I understood that the
destination space can also be used for blending, it only needs to be

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