RGBA32 and ARGB32: what are they? what's the difference?

Unity Engine
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1

Unity has both TextureFormat.ARGB32 and TextureFormat.RGBA32.The document says it’s 8bit each channel in [0…1] range. But what are these formats exactly? 8bit is usually [0…255]. Do they just represent [0…255] divided by 255?

Also why are there both ARGB32 and RGBA32? When should I use which?

2

There’s a note in the link with ARGB32 that explains the difference. Normally you’d use RGBA32.

Yes.