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UMAX Astra 2100U Owner’s Guide
41
Using the Brightness Bar
This setting determines the overall intensity level (gray level) of an
image. Moving the slider on the scroll bar to the right increases the
brightness. Moving it to the left decreases the brightness. The
default setting is zero 0. The maximum brightness setting is 100,
the minimum setting is –100.
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 are 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 is 1 (which is 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 (which is black), the minimum
setting is 0.