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The Method applies to the way the scanner captures and digitizes
the image. The default Method settings for the built-in Type of original templates are
optimal in relation to the kind of original in question and you shouldn't have to change
them.
This same setting can also be accessed directly from the Copy tab
dialog. The default Lightness value is set to zero which works well with most documents. You
can change this value to make the copy lighter (positive value) or darker (negative value)
and compensate for dull or faded originals.
Saturation indicates the intensity of a hue, or in other words
the strength of a color. A high saturation makes a color's hue more intense than the same
color with a low saturation value. A positive value increases saturation and a negative value
decreases saturation.
You can adjust your copy's color balance during image capture
through separate controls for each of the three color-channels Red, Green, and Blue. Adding
and subtracting an amount of a color affects the whole color balance. Often it's best to keep
the three channels on the same levels. Experiment with the different effects through
previewing.
Select negative values to reduce the total content of the color and
select positive values to increase the total content of the color.
- Black enhance and background clean
The black enhance option is used to change dark graytone colors
to true black.
For example, if you are copying a brochure with a mixture of text and
pictures, the text will often be digitized to a color that we may see as black but really is
a dark graytone. When the printer digests this graytone data, it will print the original's
text with a halftone pattern, meaning scattered dots instead of solid black.
By increasing the black enhance value, you can get the text to be copied
in real black and it will therefore appear clearer.
Use the black enhance option with caution, because it can change other
dark colors (not only grays) into black, making small dark spots appear in the picture.
Background clean is used if you have an original with a background
that is not completely white. If you want your background to appear as pure white then you
can increase the background clean value. As with black enhance, background clean should be
used with caution, as it can also affect some of the other light colors.
Both black enhance and background clean function as "cutoff" values
in which pixels under or over a certain value are affected by the setting.
You define cutting points on a scale of low to high lightness measured in values from 0 to 255.
The default value of both options is zero (no effect).
Example:
You have copied an original and want to improve it by making the
text blacker and the background whiter:
- Adjust the black enhance value upwards from its default
of zero (to 25, for example) and thus make pixels with low lightness values go to black.
- Adjust the background clean value upwards from its default
of zero (to 25, for example) and thus make the pixels at high lightness levels go to white.
You can give your copy sharper lines with the Sharpen option. The
Sharpen feature identifies edges in the image and intensifies them.
The Blur feature blends colors and thus removes unwanted "noise"
during image capture. Many images are created with dithering, which is used for representing
different colors in the original, and this dithering often creates unnecessary "noise" in the
image. Blurring smoothes out unwanted transitions between colors. With Black and White
copying the Blur feature smoothes out gray dither by removing unwanted sharp transitions
between excessive shades of gray.
Don't think of blurring as the opposite of sharpening. Sharpening
works on the image's edges only while blurring looks at whole color or graytone areas and
smoothes them out.
TIP: Using Sharpen together with the Blur
feature can often enhance image quality by first blurring away noise in the image and then
sharpening the result.
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