looks like (roughly, intent): prod_{n=1)^(\infty) (3/pi) * arcsin(a * sqrt(3)/2 + b * q^{n}), where a and b are on the unit circlepic.twitter.com/izdRkB1DUS
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@tomcuchta: I have implemented the complex arcsine (in the New Jersey fashion)
The human eye isn't very linear to colour levels, so it maybe a different approach would give more contrasting/interesting colours - IF as I understand, how you have mapped colour to the modulus. We all see things very differently, as I discovered when testing some medical...
imaging software I developed using colour mapping, Only to find the radiologist I was working with, who had excellent black and white vision, also was partially colour blind!
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