FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -To represent a color on the screen, each pixel actually consists of three color components: red, green, and blue. These are frequently refereed to as the pixel’s RGB value. For example, assume the value (intensity) of red, green, and blue can each take on 256 values (0 through 255) for a pixel.

Detailed explanation-2: -Each pixel on a computer screen is composed of three small dots of compounds called phosphors surrounded by a black mask. The phosphors emit light when struck by the electron beams produced by the electron guns at the rear of the tube. The three separate phosphors produce red, green, and blue light, respectively.

Detailed explanation-3: -Each color pixel is composed of three separate color components. These components can be represented as combinations of red, green and blue (RGB), or hue, saturation and intensity (HSI). For both RGB and HSI, each component of a pixel is converted to a value from 0 to 255.

Detailed explanation-4: -Using this scheme to represent all the pixels of an image takes one third of the number of bits required for 24-bit colour, but it is not as good at showing smooth changes of colours or subtle shades, because there are only 256 possible colors for each pixel.