User`s guide

Sample Scanning 4-27
Tone Curve
This tool allows you to either set a gamma value or completely customize the mapping
of the scanned image to output image data. Setting a gamma value allows you to adjust
the contrast of mid-level grays without greatly affecting the highlights and shadows of the image. Using
the custom curve tool, the contrast in any area (highlights, midtones, or shadows) can be adjusted. This
tool can be used either on all colors at once or on individual color channels.
Brightness & Contrast
This tool lets you control the brightness and contrast levels of the entire image.
Increasing the brightness makes all tones in the image lighter. Contrast is the range
between the darkest and lightest shades in the image, and increasing the contrast makes greater separation
between the darkest and lightest areas of the image.
Using Advanced Image Correction
The Advanced Image Correction (AIC) features include several powerful controls for image adjust-
ment and enhancement. The use of the AIC was covered in an earlier section, and below is a more
detailed explanation of each AIC feature.
Color Correction dialog
box:
Filter
This tool lets you apply
filters or special effects to your images, such
as blur, sharpen, edge enhancement,
gaussian blur, and unsharp masking.
Color Correction
This tool lets you adjust
or remove a particular color cast from an
image by means of the color wheel. You can
also adjust saturation, or the degree of hue
in the color.
Threshold
This tool, which applies
only to Line Art images, lets you set the
lowest color value of the scanned image that
will appear white in the output image. All
areas of the scanned image with lower color
values than the threshold value will appear
black in the output image. This tool also
allows users to sharpen the image before the
threshold value is applied.
Descreen
This tool lets you remove the moiré patterns that
result when you scan using previously printed
material (such as photos taken from books or
magazines), as opposed to using original
photographic prints as your source material.