Definitions for "Bits per Pixel"
Number of bits assigned to represent grey level, or luminance and chrominance, information in a single pixel. Indirectly, the number of different discrete levels that represent the variations of such information. For example, 8 bits per pixel can yield 256 distinct grey levels.
Sometimes referred to as colour depth, the number of bits per pixel defines the maximum colour variations available for each pixel that appears onscreen. 8- bit colour allows 256 individual colours. 16-bit colour allows 65,536 colours, and so on.
A number representing the amount of color information of a pixel.