The script includes the following functionalities:

• Loading the image onto the canvas when an image file is uploaded.
• Applying different dithering algorithms based on the selected option.
• Providing predefined color palettes for different dithering options.
• Implementing error diffusion dithering, Floyd-Steinberg dithering, Atkinson dithering, and blue noise dithering.
• Providing a download button to save the dithered image.

The dithering algorithms work by finding the nearest color from a predefined palette and distributing the quantization error to neighboring pixels to produce a more visually pleasing result.