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What does it mean exactly if someones asks me for a .PNG file which is 24bit?

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    Welcome on GD.SO, Andrew. A simply answer to this question could find with a simple search, for example see here. If your question requires more detail, please write some more. Mar 3, 2016 at 14:45
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    @PaoloGibellini GD.SE - We are not Stack Overflow ;)
    – Cai
    Mar 3, 2016 at 14:49
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    Stack Overflow is technically still part of the Stack Exchange network, so that would be SO.SE
    – PieBie
    Mar 3, 2016 at 15:19
  • @CAI a typo... :-P (but I'm still very fond on SO, perhaps unconsciously I'd like a fusion of GD and SO!). Mar 3, 2016 at 15:28
  • I agree with Pablo. Actually this question is still more generic. If a person asks for a 24 bit png, that person needs a 24 bit png.
    – Rafael
    Mar 3, 2016 at 15:48

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It's actually quite simple. You have few types of PNG files.

1) PNG-8, which stands for 8 bit, supports up to 256 colour indexed palette. Which works very similar to GIF files.

2) PNG-24 works very similar to PNG-8, it however supports to over 16 million colours (2^24 = 16,777,216 to be exact).

3) PNG-32 which is pretty much PNG-24 + Full alpha transparency

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    In particular, PNG-24 refers to the 24-bit pixel size, 8 bits per color (the PNG spec calls this a color-type 2, bit-depth 8 image). Mar 3, 2016 at 23:28
  • Photoshop doesn't support it but you can also make a PNG-8 with a full 8-bit transparency. I like to call in a PNG-16 :)
    – Mysterfxit
    Mar 4, 2016 at 4:51

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