Why does this image look so bad when dithered with a certain palette?

1. Does JPG support dithering?
2. Why would you dither an image?
3. What is the best dithering algorithm?
4. What does dithering do in image processing?

Does JPG support dithering?

Browser dither can occur with GIF, PNG, or JPEG images.

Why would you dither an image?

Dithering is used in computer graphics to create the illusion of color depth in images on systems with a limited color palette. In a dithered image, colors that are not available in the palette are approximated by a diffusion of colored pixels from within the available palette.

What is the best dithering algorithm?

Floyd-Steinberg dithering is easily the most well-known error diffusion algorithm. It provides reasonably good quality, while only requiring a single forward array (a one-dimensional array the width of the image, which stores the error values pushed to the next row).

What does dithering do in image processing?

Dithering is the process of defining gradations of gray or color shades in a 2-D graphic by varying the gray or color shades in the neighboring pixels. Dithering creates a halftone effect, but gives less resolution as shown in Figure 99 on the right. NOTE Dithering currently works only for 2-D images.