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what does 24bit mean exactly when referring to .PNG image file


Question

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

2016/03/03
1
0
3/3/2016 2:37:00 PM

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

2016/03/03
3
3/3/2016 3:13:00 PM