What are the necessary properties of D to obtain the appropriate patterns for the different input gray levels? How do quantization levels effect the result of dithering? Use gray2ind to display a...

What are the necessary properties of D to obtain the appropriate patterns for the different input gray levels? How do quantization levels effect the result of dithering? Use gray2ind to display a grayscale image with fewer grayscales, and apply dithering to the result.