Re: [Openexr-devel] Introduction and CTL/ICC question

[Kai-Uwe Behrmann]

Am 10.03.05, 00:51 -0800 schrieb Paul Schneider:

> In other words, I think you'd run into the same limitations as the current ICC
> implementation with a gamma-ramp approach, even if you were just correcting
> for display.  You don't have these problems if you manipulate floating-point
> data in OpenGL.  It could be that I misunderstand your intentions, though.

Ok, I understand now. Applying linearisation to high precission data will 
fill all shades in 8-bit. I explain this scheme to others quite often, but 
sometimes I am sticked myself to old thinking.

> If you want to manipulate the gamma ramp on an OS X machine, check out
> CGDirectDisplay.h: specifically, CGSetDisplayTransferByFormula() and
> CGSetDisplayTransferByTable().  I've used these with success in the past.

Thanks, I will have to look after.

regards
Kai-Uwe Behrmann
                                + development for color management 
                                + imaging / panoramas
                                + email: address@hidden
                                + http://www.behrmann.name