Data form definition
Data format
The data format function determines how many bits are used to represent one pixel. Increasing the bits increases the number of shades and intensity that can be expressed. However, the data required to represent an image is also increased. For example, to scan an A4 size image using 8 bits per pixel at 300 dots per inch (dpi) in color would require 26.4 MB of data.
Also, if your printer or CRT is not capable of expressing these differences in color and shade, there is no reason to produce such precise (and sizable data).
8 bit | 2 bit | 1 bit |