RGB or RGBA color code

A color can also be specified as a tuple of three to four float numbers between zero and one, such as (0.1,0.1,0.2) or (0.2,0.2,0.3,0.8). The first three numbers define how much red, green, and blue light should be mixed into the desired color output. The optional fourth number is the alpha value to control the transparency level.

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