Descreen - Canon CanoScan D646U User Manual

chapter 4
What is on the
Screen?
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Descreen

Click this check box if you want ScanGear CS-U to conduct moiré
reduction to improve the overall image quality. Moiré are dot patterns
that interfere with processing images for professional use and are usually
caused by poor dithering resulting from scanning images from
newspapers, books, magazines, etc.
Unsharp Mask
Click this check box to switch the Unsharp Mask feature on and off.
Sharpens an image, such as a photograph that is slightly out of focus, by
emphasizing the contrast to make outlines clearer.
• When the image would not be improved with
Descreen, try to switch the Unsharp Mask function
off.
Note
• The effects by Descreen and Unsharp Mask will not
show in the Preview area.
Test Scanner
Click this button to open the Scanner Diagnostics dialog box. Click the
Start button in the Scanner Diagnostics dialog box to test your Scanner.
After the test is complete, a message is displayed here to inform you of
the results. If a problem is reported after the test, use your scanner
instructions to troubleshoot the problem. During the test, do not open
the document cover of the scanner.
Calibration
Click this button to start calibration. Calibration is the adjustment of
color processing for input and output devices so the colors in the
scanned image match the colors you see on the computer screen and in
the printed image. During calibration, do not open the document cover
of the scanner.
Quick Preview
During previewing, if you are running other tasks simultaneously which
may burden the computer extremely (i.e.: playing animation and starting
and editing a file with a size of more than 100MB), uncheck this check
box to set this setting off. The initial setting is "Checked (On)".
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