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Question by nyonge · May 30, 2017 at 10:20 PM · coloralphafloatbytecolor32

Float to Byte for Color32

How do I take a float (0f to 1f) and convert that to a byte (not a byte array) for a Color32's alpha channel (0-255)?

I have an function I wrote awhile back, SetAlpha, that takes a float from 0f to 1f and sets it to the alpha channel of a Color. With some new changes I've made, I now need to use Color32 instead of Color to set alpha. Accessing .a doesn't work as it takes a byte, not a float (and I can't Mathf.RoundToInt either).

I suspect this is probably pretty simple but I've never worked with Color32 before, and don't know the syntax. Thank you!

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Answer by IgorAherne · May 30, 2017 at 10:32 PM

 (byte) (your01float *  255)

lol'ed

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avatar image superme2012 · Nov 14, 2017 at 10:12 PM 0
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Thanks for the info.

.toByte() would be nice.

avatar image zenixue · Apr 15, 2020 at 02:53 PM 0
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i love u!!!

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Answer by FM-Productions · May 30, 2017 at 10:37 PM

You could try this:

float randomAlphaValue = 0.43f;

color.r = (byte) ((int) (randomAlphaValue * 255) % 256)

The modulo % 256 is not strictly necessary, since only the right-most byte of the int value you pass is used. You could also omit the int casting.

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avatar image IgorAherne · May 30, 2017 at 10:38 PM 0
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meh to complex

avatar image FM-Productions IgorAherne · May 30, 2017 at 10:41 PM 1
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You are right, I saw your answer only after I have written $$anonymous$$e. But I will leave $$anonymous$$e also here :)

avatar image RayAndGames FM-Productions · Oct 19, 2019 at 03:55 AM 0
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such humble... such kind

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Answer by bison-- · Sep 14, 2020 at 06:02 AM

I casted it to Color32 like this:

 UnityEngine.Color sourceColor = new UnityEngine.Color(0.5f, 0.5f, 0.5f, 0.5f);
 UnityEngine.Color32 convertedColor;
 convertedColor = sourceColor;

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