Palette; Dither - Microtek ScanMaker 6400XL Reference Manual

• CMYK color separation is used for commercial printing. Some image editing
software program, such as Photoshop 5.0 full version, have the capability of
processing CMYK file format. ScanWizard Pro CMYK color supports US
SWOP, European, and Japanese printing ink standards. For more informa-
tion, refer to Appendix C.
• Web/Internet color is 256-indexed color image converted with uniform
palette and error diffusion. The sRGB (web color standards) profile is used
for color matching with this image type.
• Customized 256 color option lets you select the attributes of indexed color.
If this option is selected, the following dialog box displayed.

Dither

Lets you choose the dithering method. Dithering can further improves the
256-index color image quality by mixing the available colors to simulate the
missing colors. "None" disables dithering; "Pattern" uses a structured pattern
to simulate the missing colors, this option is grayed out for Adaptive palette;
and "Diffusion", which is the default, produces the best quality of 256-
indexed color image with lowering a little bit the scanning speed due to
intensive algorithm computation is required.
• Default attribute of 256-color is the last customized 256-color setting.
• B&W Diffusion image type is 1-bit B&W image dithered with error
diffusion effect.
• Save As 256 color
You may save the palette and Dither selections as the defaulted 256
colors, to be selected from the Type menu.

Palette

Lets you choose the method of creating
color palette table. "Uniform" uses 6-6-6
levels fixed color palette table,
independent of the contents of the 24-bit
RGB image. By default, the "Adaptive" is
selected, this option creates color palette
table from commonly used areas of the
color spectrum that appears in the image.
Since colors in most images are
concentrated in particular areas of the
spectrum, this option is generally used.
Reference: The Settings Window 51