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ADJUSTING THE ISIS SCAN SETTINGS 111
■ 24-Bit Color—Scans the image in full color. Use this setting to
scan color photographs and other color images. The file size is
the largest of the scan mode options.
Dither—Only available if the Mode is Black and White. Click the
menu arrow and choose a Halftone option or Diffusion from the
list.
■ Halftone—Converts the image so it appears to consist of gray
tones. Halftones produce simulated gray tones by using black
and white pixels of different sizes and is often used to produce
newspaper and magazine images. Use this setting for lower
resolution black and white images. The halftone settings also
produce small file sizes.
■ Diffusion—Also converts the image to gray tones, but diffuses
the grays to nearby pixels to give the image a grainy, film-like
texture. Diffusion is useful for viewing images on a black-and-
white screen.The preview image shows the effect of your Dither
selection so you can see which one is best for scanning.
Dots per inch—Click the menu arrow and choose a resolution
(dpi). Your scanner can scan at up to 600 dpi.
Page Size—Click the menu arrow and choose a page size. Your
scanner can scan a page up to 8.5" x 14".
Brightness—Drag the sliders or click the arrows to the right or left
to adjust the brightness in small increments. Click the buttons
Darken, Normal, or Lighten to move the slide in larger steps.
Contrast—Drag the sliders or click the arrows to the right or left to
adjust the contrast. Contrast is set automatically for Black and
White scans.