My code can (optionally, since it is often not useful) dither all the way down to the physical pixels of your display device for that really crisp, old-fashioned look. Most dithering projects on the web don't take this into account so look slightly soft around the edges of the pixels.

The image at the bottom is an example. On some devices this interacts weirdly with the pattern of pixels or even the refresh rate when in motion due to scrolling.