User manual

6 • Scanning line art
ColorQuartet 5.0 Pro
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9 • Now check the image in the feedback window. If you want to raise or lower the threshold to
make the image darker or lighter, respectively, open the Highlight/Shadow window and
adjust the Histogram.
10 • When the image is the way you want it, click on Ready to Scan to put the job in the queue
and choose Do Jobs from the Scan menu or tool bar to start the scanner.
TIP: If you need to scan a large line art original or a series of line art originals that all have similar
content, a good strategy is to make a very large preview scan of a small but representative part of
the image, adjust the Histogram for an appropriate threshold, save this Highlight/Shadow set-
ting, and then go back and do the actual scans, applying the saved Highlight/Shadow setting to
each scan.
Line art scanning with ScanDot
If you often need to scan line art originals at high resolutions (1200 dpi or higher), you may want
to purchase the optional ScanDot module. ScanDot is intended mainly for rescanning screened
separations, but can also be used for high-resolution line art scanning of both transmissive
(transparent) and reflective (opaque) originals. Please contact your local Purup-Eskofot dealer
for more information.
• The line art threshold is not shown explicitly, but it does exist. It is fixed at
about 52% on the horizontal scale.
• By dragging the histogram towards the left, you can, in effect, move the thre-
hold to the right in relation to the tonal information in the image, making
the entire image darker.
• Conversely, by dragging the histogram towards the right, you effectively
move the threhold to the left, making the image lighter.
• Use the feedback window to guide you as you adjust the histogram.