Direct Coding

1. What is direct coding?

def::Certain amount of storage space are used to represent each pixel to code its color

3 bits for each pixel, one for each primary color. Hence the result will be something like this ...

![[Pasted image 20220202205243.png]]

For industry standart direct coding, we use 3 bytes/ 24 bits per pixel.
- Thus ...
  - Each primary has 256 different intensity level
  - In this case total number of pixels are 256X256X256 = 16.7 million.
A notable special case of direct coding is the representation of black-and-white (bilevel) and gray-scale images, where the three primaries always have the same value and hence need not be coded separately. A black-and-white image requires only one bit per pixel, with bit value 0 representing black and 1 representing white.