Is there any way to set customized pigment set?

[universewill]

Is there any way to set customized pigment set?

[mdop]

If you mean mixing pigments using the library: They are just RGB values. If you mean a set of pigments which are the basis of the mixing algorithm that define the pigment color space (here Phthalo Blue, Quinacridone Magenta, Hansa Yellow, and Titanium White) then you would need to modify the code. If you look in the python implementation the pigment data seem to be encoded in _lut, which would have to be recreated for a different pigment set. The calculations in float_rgb_to_latent and _eval_polynomial would probably also have to be rewritten.