User manual

22 • Sharpening an image (unsharp masking)
ColorQuartet 5.0 Pro
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3 • Place the Navigator frame as desired and click on the Scan button in the Unsharp Masking
window to make a high-resolution scan of the framed area.
4 • When the scan has been made, you can try out different settings for the USM par
ameters
and see their effect interactively before deciding what to use.
5 • When USM is set the way you want it, you may want to save the setting to disk for repeated
use. Before doing this, you may want to try it out on several different images first. The crops
that are currently in the job queue can be read in from the Image list. See also U
sing stan-
dard images to adjust USM, below.
6 • When you are satisfied with the USM setting for the current image, click on OK to return to
the Scan Setup window and, if necessary, adjust other scanning parameters before starting
the final scan.
Using standard images to adjust USM
The USM feedback function can be used with already scanned images, provided they are in
TIFF Lab format. This feature makes it possible for you to save unsharpened TIFF Lab scans of
different, representative images to disk (for example, human portrait, landscape, still life, shiny
machinery, etc.) and load them into the Unsharp Masking window whenever desired. If a new
image you need to scan is enough like one of these standard images, you may be able to work
out the USM settings on the standard image, thus avoiding having to wait for the current image
to be scanned first. To get you started, the ColorQuartet CD includes a folder called USM Sam-
ples with a few representative images that you can experiment with.
• A special scan will be made, using the actual scan resolution you defined in
Scan Setup, but without any sharpening, regardless of how the USM param-
eters are set.
• This step is important because USM depends on scan resolution, so you
need to view a high-resolution scan to effectively evaluate USM changes.
• The Sharpened/Unsharpened field gives a 1:1 display of the part of the image
that is framed in the Navigator field. Half of the Sharpened/Unsharpened
field shows the image with no USM. The other half shows how the current
USM parameters will affect the image.
• Click anywhere in the Unsharpened field to change which part of the image
is displayed as sharpened and which is not.