WEB AUTHORING. MAT 108

Alejandra Jarabo
Media Arts & Technologies Division.sbcc
COMPRESSING GRAPHICS II
TO NEXT PAGE
 
This is the original graphic at millions of colors
The gradients look continuous and perfect
 

We can see how this graphic would be seen at a monitor set to 5 bit-color depth by compressing it into a gif with 32 colors.
There are different ways to make up for those colors that we don't have, those methods use a dithering princliple (creating yuxtaposition of different colors to give an illusion of a different shade)
Adaptative palette_Dithering by Diffusion Adaptative palette_Dithering by Pattern Adaptative palette_Dithering by Noise
 

If dithering is not used, the image will be shown with a certain amount of flat colors

 
Perceptual palette_ No dithering Selective palette_ No dithering Restrictive palette_ No dithering