Re: [Lcms-user] GPU accelerated transform with a LUT?

[Gerhard F. <nos...@gm...>]

Paul Miller wrote:
> Graeme Gill wrote:
>   
>>> Has anyone done any work with building a 3D LUT out of an lcms transform 
>>> and then doing the conversion using a 3D texture lookup?
>>>       
>> See "Using Lookup Tables to Accelerate Color Transformation"
>> by Jeremy Selan, GPU Gems 2 pp 381 Addison-Wesley for more details.
>>
>> Such an approach is used by many of the 3D animation studios
>> to do color managed previews of animation's. The example OpenEXR
>> viewer is such an instance, and the source code is available.
>>     
>
> Yes, I've done that kind of stuff myself. I was just wondering if there 
> were any recipes for getting the 3D LUT out of lcms.
>   

Some time ago I played a little bit with this kind stuff too. Attached
is a simple OpenGL program for viewing a ppm image (sRGB), doing the
color transformation to the supplied display profile with a GLSL shader.
The program uses LCMS to create the color transformation texture (device
link).

Regard,
Gerhard