Plustek Opticpro A320E Flatbed Scanner - Manual (Page 57)

TWAIN Help 22
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changes to one of these channels).
Shadow:
The shadow represents the low (dark) end of the color spectrum. If the shadow
value on the Master channel is raised to 10, all color values between one and
ten will be given the value of zero (black). Thus, raising the shadow darkens
the entire image and raising the shadow in a specific color channels darkens
pixels of that color. Raising the shadow also increases the color contrast of
darker tones (the range between the midtone and the shadow).
Default
Clicking the Default button on the lower right corner revert the settings to its
original values and discard all adjustments you have made.
· Ticking the Auto Density checkbox will automatically adjust the
histogram to give high quality images without needing to manually
adjust the settings in the
Histogram tab.
· This feature is not available when Black & White is selected as
Scan Mode .
2.2.2.7 HSL
This tab allows you to adjust the colors in an image.
You may adjust Hue, Saturation and Lightness respectively either way:
· Slide the thumb of the scroll bar to the right or left.
· Click the arrow signs on the right and left ends.
The current value is shown to right of each scroll bar.