White balance offset (for IR work)

[szgabor (Gabor)]

@ilias_giarimis

I apologize for the late response … it’s because I pass through the forums in a hurry lately … so I forgot this.

No problem, this time I was also somewhat late.

@ilias_giarimis

The idea is same with what I used to calculate the above matrixes. Based on the assumption that with IR light all Bayer color filters have same response (i.e we have an almost BW shot) I used a (almost …) unitary RGB matrix and the WB multipliers and then converted to XYZ. I cannot remeber exactly the workflow now … I am away from my home PC, but tomorrow I 'll be back and be able upload an xls with the calculation.

Thanks in advance. I like to be self-succicient

@ilias_giarimis

BTW is the optimum with IR to have a perfect gray rendering as a start or is it better to be able to distinguish colors according to Bayer CFA response (as we saw in the samples green renders blueish so I suppose the response is not exactly equal) ?.

Of course, IR pics should retain all their colors - those can be an integral part of their look. RT has all the necessary tools to bring the maximum out of them. The colors are real, that is, they tell something about the wavelengths being reflected. (I have a lot of knowledge on IR photography and its physics, if anyone is interested!)

If someone wants monochrome results, s/he can either use a filter with a longer cut-off wavelength and then use spot or auto WB to make it completely gray, or simply use the black&white effect.