12.0

PaperPort Getting Started Guide 28
Set black
point
Click this tool, then click on a dark color in the
image that will become the black point. The colors
chosen for the new white and black points are
displayed on the Status bar.
Apply
current
black and
white points
Click this tool to apply the new black and white
points to the current image. If the result is not
acceptable, undo your changes and pick new values.
Changing the black and white points
You can do this to improve image quality by removing the very dark and
overexposed areas. All colors lighter than your chosen new white point will
become white. All colors darker than your chosen new black point are set
to black. A typical use for this is to remove a shaded gray background in a
document you want to OCR. Select one of the darker gray pixels from the
background and apply it as the white point. Then the background will
become white. Changing black and white points for a color photo will
typically increase its contrast, but may also change color values.
You can apply new black and white points to individual images, as
described. You can also apply them as an auto-enhancement to all new
pages scanned with a given scan profile.
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New white
po
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New blac
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p
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Before:
After: