Plustek Opticpro A320E Flatbed Scanner - Manual (Page 121)

Scanner Buttons Guide 46
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You may adjust the brightness either way:
· Slide the thumb of the scroll bar to the right or left, which adds lightness or
darkness to all colors in your image.
· Click the arrow signs on the right and left ends.
The current value is shown to right of each scroll bar.
Contrast
The higher the contrast, the sharper the image. The lower the contrast, the more
blurry an image will be.
You may adjust the contrast either way:
· Slide the thumb of the scroll bar to the right or left, which raises or lowers the
differences between light and dark colors in your image.
· Click the arrow signs on the right and left ends.
The current value is shown to right of each scroll bar.
This feature is not available when Black & White is selected as Scan Mode.
Gamma
Image Gamma is used to adjust the colors in the image that will be scanned into
the computer. Gamma values are primarily a measure of the brightness of a color.
The larger the gamma value, the brighter the color becomes.
Do one of the following:
· Slide the thumb of the scroll bar to the right or left; or
· Click the arrow signs on the right and left ends.
The current value is shown to right of the scroll bar.
This feature is not available when Black & White is selected as Scan Mode .
Threshold
Threshold sets the color level for converting an image to line art, which can adjust