Photoshop's spot-color channel mixing algorithm -


photoshop seems have special mode blending spot-color channels. let's @ example: blending full opacity red #ff3c1f full opacity cyan #1cd4c6.

if create 2 spot-color channels solidity 0% , set colors #ff3c1f , #1cd4c6 , fill them black #91550d:

spot color mixing

now, know combining colors complex problem that's not well-posed (see related question). result photoshop gives gets close reality of time me. can me understand how photoshop blending?

i have read on adobe forums it's multiplicative blending in cmyk. tried reproduce layers, getting #7d4339:

cmyk multiply blending

i know cmyk device-dependent i've tried lots of various profiles none worked spot-color channels. screenshot using u.s. web coated (swop) v2 profile.

i tried multiply blend in lab , in rgb, further off.

i appreciate insight on whatsoever. thanks!


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