I want to know further about this in order to understand further why the veins are blue when the baby get the cyanosis?

We know that, skin get its color by the subtractive mechanism of color mixture. And in the dermis there are many substance for instant, protein, hemoglobin, melanin etc that removed color and I think it is kind of a transfer function.

What is the relationship between transfer function, H(f) with molar extinction of oxyhemoglobin & deoxyhemoglobin? So far, we know that a control system of H(f) is = 1/s-1, 1/s.

Can i  assume that the transfer function of the skin chromophores (skin tissue, fat, melanin etc)  = 1 / molar extinction of oxyhemoglobin/ deoxyhemoglobin?

Or can I assume that a transfer function of hemoglobin = molar extinction coefficient itself?

If so, can you suggest any papers or articles that related with this.

Thank you.