How to get effective result (6-digit hex value) of solid background color and translucent overlay color?

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November 20, 2018, at 06:20 AM

Let's say I have 2 colors: a solid background color (6-digit hex value) and an overlay color with opacity (6-digit hex value and some opacity percentage).

What is a function for getting the effective resultant color (6-digit hex value)? In other words, if I paint both colors over the same area (background first, then overlay) and then use a dropper tool to get the color value, how can I programmatically get the same color value?

Any programming language (even pseudocode) is fine here.

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