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when i save an image in Photoshop as a PNG-24 with trans on, does PS actually convert that to PNG-32 but not tell me about it?

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Some good clarifications about this issue: DeepBlueSky Blog: The difference between PNG24 and PNG32 Graphic Design SE: PNG32 vs PNG24 vs PNG8 – awe Jun 6 '12 at 11:49

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Yes. Transparency is the other 8 bits. PNG32 = 8 Red, 8Green, 8 Blue, 8 alpha

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