User`s manual

Reference: The Settings Window 59
• Palette: The Palette option lets you choose the method for creating the
color palette table. Uniform uses a 6-6-6 fixed color palette table.
Adaptive (default) creates a color palette table from the more
commonly used areas of the color spectrum that appears in the image.
• Dither: The Dither option can improve the color quality of the 256-
indexed color image for photographs or continuous-tone images, using
a technique of mixing available colors to simulate missing colors.
None provides no dithering. Pattern uses a structured pattern to
simulate missing colors. Diffusion (default) uses the error diffusion
technique to dither colors and produces the best quality for 256 colors.
G. Line art: Line Art images are made up of one bit of color (black or white)
per pixel. Few editing options are available in this mode, but this mode is
useful for images consisting purely of black and white or even single
colors, such as mechanical drawings, blueprints, or fine-line illustrations.
H. Black-and-White Diffusion: This is a single-bit black-and-white image
dithered with error diffusion. The black and white pixels are arranged in a
way as to “fool” the eye into seeing gray.
F. 256 Colors (Default) / 256 Colors (Custom): These are single-channel
images (8 bits per pixel) that use a color lookup table containing up to 256
colors. The file size is smaller for images in this mode. As an initial setting,
selecting 256 Colors (Default) uses an Adaptive palette with Diffusion. If
the 256 Colors (Custom) option is selected, the dialog box below appears.