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Question by nyonge · Feb 03, 2016 at 01:10 AM · ui sprite performance optimization alpha

Sprite Alpha Performance

I'm making a game for iOS/Android, so performance is paramount. Generally I export as many images as possible as 8-bit pngs, with a binary alpha channel - either it's visible or it isn't, no 50% opacity.

For sprites that NEED opacity, is it better to have the alpha channel baked into the sprite (24-bit PNG), or to still use an 8-bit PNG and simply adjust the alpha channel of the colour used in-game, on the Image component? It affects the whole image but that's fine in my case. Is there a difference in performance?

Using the most recent build of Unity, with the native Unity UI.

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