||A closest distance algorithm is used to map image colors to the
palette. No error correction is performed. Fast, but the resulting
image quality depends on the distribution of the colors in the
||Ordered dither using predefined error matrices. Offers the best
balance between speed and quality but uses a lot of memory (512kb).
||Simple ordered dither without error correction. This is the
fastest method but uses a lot of memory (512kb).
||/* no underlines */
||/* a single, solid, underline */
||/* a double, solid, underline */
||/* a single, dashed, underline */
||/* a double, dashed, underline */
||A closest distance algorithm followed by Floyd-Steinberg error
diffusion. Slowest method but highest quality.
||disables palette mapping. This is the default setting.