Microtek ScanMaker 5 Guide de l'utilisateur télécharger pdf (Page 108)

5-34 Microtek ScanWizard 5 User's Guide (Macintosh)

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 spec-

trum 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.

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 Adap-

tive palette with Diffusion. If the 256 Colors

(Custom) option is selected, the dialog box

below appears.

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Microtek ScanMaker 5 Guide de l'utilisateur Page 108