colors - Programmatically darken a Hex colour

Question

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 Answer

深蓝 · Answer 1 · 2021-10-06T05:16:22+0000

If you're not bothered about too much control, and just want a generally darker version of a colour, then:

col = (col & 0xfefefe) >> 1;

Is a nice quick way to halve a colour value (assuming it's packed as a byte per channel, obviously).

In the same way brighter would be:

col = (col & 0x7f7f7f) << 1;