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Quotehaving a good documentation in one place might be longer to read, but at the end one should know about all the available options.
defineColor(name, r_c_rgb)
defineColor(name, r_or_c, g_or_m, b_or_y[, k = None])
defineColor("red", 255, 0, 0) # creates a rgb red
defineColor("red", 0, 92, 48, 0) # creates a cmyk red
defineColor("red", 51, 53, 71, colorModel="lab") # creates a lab color
defineColor("red", 255, 0, 0, colorModel="rgb") # creates a rgb red
defineColor("red", 0, 92, 48, 0, colorModel="cmyk") # creates a cmyk red