User`s guide

4-24 Microtek ScanWizard 5 User’s Guide (Macintosh)
Grayscale:
Grayscale images use
shades of gray to
simulate gradations of
color or tonal values,
and contain 8 bits per
pixel. The Grayscale
16-bit option is
provided in
ScanWizard 5 for
professional pre-press
scanners.
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.
• 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, using a technique of mixing avail-
able 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.
Web / Internet Colors:
This mode is useful for displaying images on the Web or Internet.
Output for the Web / Internet color mode in ScanWizard 5 is 8-bit, 256
indexed color images.
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.
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.
Grayscale: 208K
Indexed color: 208K