I do not see very big problem I do not see very big problem here. To check color accuracy it is better to check something with known colors and even spectral response (e.g. color checker) and known light source, not wall with unknown dye used under unknown light -- Alex Tutubalin @LibRaw LLC reply
I do not see very big problem here.
To check color accuracy it is better to check something with known colors and even spectral response (e.g. color checker) and known light source, not wall with unknown dye used under unknown light