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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 decreases the gray shades
between light and dark areas. Moving it to the left increases the 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 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 right decreases the brightness in shadowed areas.
Moving it to the left increases 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 variation in their
light sensitivity characteristics. To get a scanned image with good results,
VistaScan provides gamma adjustment capabilities so you can compensate for
this variation in your scanner.
Moving the slider on the scroll bar to the right increases the brightness of the
mid-range gray tones. Moving it to the left decreases the brightness of the mid-
range gray tones. The default setting is 1.5.
Reset Button
Click on the
Reset
button to cancel any changes you made and return the
values to the default setting.
Adjusting the Image Tones
The Curve command is another way to make precise adjustments in the
highlight, midtones, or shadow levels in your images. Using this feature
