[argyllcms] Re: Profiling with a known gamma shaper

On Tue, May 19, 2009 at 11:25 PM, Gerhard Fuernkranz <nospam456@xxxxxx> wrote:
> Pascal de Bruijn wrote:
>> Hi,
>>
>> I had another odd thought...
>>
>> In the past I've had two methods of profiling my camera:
>>
>> 1. Directly profile against the reference values of my IT8 target,
>> giving good color accuracy...
>> 2. Profile the difference between an in camera processed image and the
>> IT8 target, giving me a great gamma shaper (very similar to camera
>> generated JPEGs).
>>
>> One of the problems I'm having with the first method would be the fact
>> that I suffer more often from blown out details...
>>
>> So I had a though, what if I just transplant the shaper from one
>> profile to another. Which I tried with the color.org ICC Profile
>> Inspector, which allows you to export and import gamma shapers, into
>> and out of profiles.
>>
>
> I think that I do not fully understand your objective, i.e. what result
> do you exactly want to achieve? My feeling is that you basically do not
> want to get a colorimetric transformation, but a perceptual one, which
> emulates the perceptual transformation done by the camera when it
> creates the JPEGs from the captured scene? But if this is the case,
> what's wrong with your method (2) then? Or do you possibly only want to
> assume the gray-axis mapping of the camera JPEG, but establish your own
> mapping for non-neutral colors? But if the latter is the case, how do
> you want to get the non-neutral colors mapped? Or do you have completely
> different objectives?

No this isn't what I'm looking for...

I basically want to predefine the gamma shaper before the XYZ matrix
is calculated...

At least, I'd like to try, and see what the results are...

Regards,
Pascal de Bruijn

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