Mathematically right values in decomposing to LAB ?

[MarionGaff]

@Elle

The problem with LUT profiles is that they do require a lot of sample points to make a super-accurate profile. But again, in your case I think a LUT will work better. So a target charts with more color patches will be better than a target chart with fewer color patches. This article goes over some of the commercially available charts: Make camera profile target shot

The professor who was setting up the “colorimeter” bought the Spyder Checkr 24. I don’t think my lab would allow me to buy another target chart with more color patches. Plus, the time that I have to solve everything is only 2 or 3 days! So, I guess I have no choice but to do with the Spyder Checkr 24.

The thing is that the Spyder Checkr 24 is supposed to be used with softwares such as Lightroom, Photoshop or Phocus

I found that link which gives explanations on how to use Spyder Checkr 24 with Raw Therapee.

SpyderCheckr possible ?

HI, I own a SpyderCheckr 24 chart and its software. Unfortunately, I can not use it because it gives formats for Adobe Focus and raw camara. (Template, xml, xmp) Is there any possibilities to use it with with RT? tks

Do you think I could manage to do all that in 2 or 3 days ?

I do not know if it is relevant, and if it might help, but I already know the (L*,a*,b*) approximate domains in which the peels will be, and these domains are small. I mean: if the purple is not perfectly calibrated, I think the impact on my L*,a*,b* values will not be very strong.

Thanks a lot