eli5 what is bit depth in film?
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How many colors are recorded.
Standard is 8-bit, 2^8 = 256 colors per red/green/blue pixel; 256^3 = 16,777,216 total colors (well, usually not all 256 colors per pixel are used, tv is 16-235 instead of 0-255 I think). This is why a bunch of color changing LEDs say >16M colors, because they are 8-bit color.
10-bit is next, that gives >1B colors.
12-bit is the current max I think, giving >67B colors.
This means there are more in-between shades. An extreme example would be that 2 colors for red would be off and full red, 3 colors would add pink.
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