WBMP format is the standard format for optimizing images for mobile devices, such as cell phones. WBMP supports 1‑bit color, which means that WBMP images contain only black and white pixels.

The Dithering Method and Dither options determine the method and amount of application dithering. For optimal compression, use the lowest percentage of dither that provides the detail you require.

You can select one of the following dithering methods:

No Dither

Applies no dithering at all, rendering the image in purely black and purely white pixels.

Diffusion

Applies a random pattern that is usually less noticeable than Pattern dither. The dither effects are diffused across adjacent pixels. If you select this algorithm, specify a Dither percentage to control the amount of dithering applied to the image.

Note: Diffusion dither may cause detectable seams to appear across slice boundaries. Linking slices diffuses the dither pattern across all linked slices, and eliminates the seams.

Pattern

Applies a halftone‑like square pattern to determine the value of pixels.

Noise

Applies a random pattern similar to the Diffusion dithering, but without diffusing the pattern across adjacent pixels. No seams appear with the Noise algorithm.