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Hello
>262144 [...] the number that's most relevant.
In fact there is 256 values possibles for each R, G or B channels (any value from 0 to 255)
Lets see HAM8:
Among them 64 can be obtained when "M"odifying an pixel (like 0 4 8 12 16 etc...)
But also the palette can be defined to use 64 other values (like 1 2 3 5 6 7 9 etc...)
those can be obtained when "H"olding a pixel to the palette
So the total is 64+64 values values possibles for each R, G or B channels
So 128*128*128 = 2097152 = 2 mega pixels not 16 as often said...
Alain Thellier
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