This is for an Android application. Let’s say that I have two colors with

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Asked: May 30, 20262026-05-30T01:32:35+00:00 2026-05-30T01:32:35+00:00

This is for an Android application. Let’s say that I have two colors with alpha

int color1 = 0x12345678  // aarrggbb
int color2 = 0x87654321

How do I compute the combined color of a layer with color2 over a layer with color1?

I found here a discussion and formula but checking here first if it is already available in Android and/or Java before writing my own code.

Edit: please note that the goal of the question is not to end with a bitmap but a color (e.g. a aarrggbb int).

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Editorial Team · Answer 1 · 2026-05-30T01:32:37+00:00

Editorial Team

I think what you want might be PorterDuff.Mode.Multiply

EDIT: Actually maybe you want mode DST_OVER for destination color “over” source color.

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