Epson GT-6500 EN - Manual (Page 24)

As you increase the amount of data, you dramatically increase the
number of minute differences in color you can represent.
Bits per pixel Monochrome shades Colors
1 bit/color/pixel 2 8
2 bits/color/pixel 4 64
3 bits/color/pixel 8 512
4 bits/color/pixel 16 4,096
5 bits/color/pixel 32 32,768
6 bits/color/pixel 64 262,144
7 bits/color/pixel 128 2,097,152
8 bits/color/pixel 256 16,777,216
1-10 Overview