Using the Contrast Bar
This setting controls the difference between light and dark areas in
an image. Moving the slider on the scroll bar to the right increases
the gray shades between light and dark areas. Moving it to the left
decreases gray shades between light and dark areas. The default
setting is zero 0. The maximum contrast setting is 100, the
minimum setting is –100.
Highlight Bar
This setting defines the lightest (whitest) tones in the scanned
image. If you broaden the range that includes the highlight points,
the pixels within the newly specified range to be remapped
allowing you to see more details in a color/gray image.
Moving the slider on the scroll bar to the left increases the
brightness. Moving it to the right decreases the brightness. The
default setting is 255. The maximum highlight setting is 255; the
minimum setting is 1 (white).
Shadow Bar
The Shadow bar defines the darkest tones in the scanned image.
Moving the slider on the scroll bar to the left increases the
brightness in shadowed areas. Moving it to the right decreases the
brightness in shadowed areas. The default setting is 0. The
maximum shadow setting is 254 (black); the minimum
setting is 0.
Gamma Bar
The Gamma bar alters the mid-range gray tones in the scanned
image. All optical devices, such as monitors and scanners, have
some variance in their light sensitivity characteristics. To get a
scanned image with good results, VistaScan provides gamma
adjustment capabilities so you can compensate for this variance in
your scanner.
Summary of Contents for Astra 6400
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