Xerox 2400 - Handbuch (Seite 30)

Three ways to scan
2-20 4800/2400 Series Installation and User Guide
3. To adjust the sharpness, drag the Fidelity slider to the left to
decrease the sharpness or to the right to increase the
sharpness.
You can also type a number directly into the sharpness setting
box, or click the up and down arrows next to the box to
increase or decrease the setting.
4. To return the settings to their original amounts, click [Reset].
The resolution and sharpen panel also includes an advanced
setting for Moire patterns. Moire patterns are wavy, rippled lines that
sometimes appear on the scanned images of photographs or
illustrations, particularly newspaper and magazine illustrations. To
scan the image and limit or eliminate the amount of moire patterns,
select the [Reduce Moire] option.
Adjusting the brightness and contrast
Sometimes an item is scanned with the brightness and contrast set
to be too light or too dark. For example, a note written with a light
pencil may need to be scanned darker to improve legibility.
The histogram shows the amount of the image (that is, the number
of pixels) at different brightness levels. From left to right, the
histogram indicates dark to light. To see this visually, drag the
Brightness slider back and forth and watch how the distribution of
pixels changes to indicate a darker or lighter image.
The figure on the left shows the brightness and contrast options.
To adjust the brightness and contrast:
1. Drag the Brightness slider to the left to make the item darker or
to the right to make the item lighter.
You can also type a number directly into the brightness setting
box, or click the up and down arrows next to the box to
increase or decrease the setting.
2. Drag the Contrast slider to the left to decrease the contrast or
to the right to increase the contrast.
The Histogram represents the settings as you drag the sliders.
For color scan configurations you can adjust the brightness
and contrast using a single color, or all together, by choosing
from the drop-down menu at the top of the Histogram.
For example, if you select Red from the menu and drag the
Brightness and Contrast sliders, you can see how the red
component of the histogram changes. Note, however, that the
Green and Blue components also change relative to those
new brightness and contrast settings.
3. Click the [Auto] button to have the scanner analyze the image
and set the appropriate brightness and contrast.