Canon 2925B002 On-Screen Manual page 280

Scan Quality Is Poor or Colors Are Scanned Incorrectly
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On-Screen Manual Scanning Guide
Are Scanned Incorrectly
Scan Quality Is Poor or Colors Are Scanned Incorrectly
Check 1: The Platen or the light source on the Document Cover may be
dusty or dirty.
Remove dust and dirt from the Platen and the light source on the Document Cover. Clean the platen or
the document cover of the scanner, taking special care not to press strongly on the platen.
Check 2: Recalibrate the scanner from the Scanner tab of the Preferences
dialog box.
Scanner Tab
Check 3: If the film is in poor condition (dirty, faded, etc.), use Reduce Dust
and Scratches, Fading Correction, Grain Correction, etc. in Image Settings
in Advanced Mode of ScanGear (scanner driver).
Image Settings
Note
If a print out of an image does not appear satisfactory or the same as what you see on the monitor,
you may need to change the printer's settings. Or, there may be a problem with the printer.
For details, refer to the manual of your printer.
Check 4: If circular stripe patterns (Newton's rings) appear, load the film
face-up and click Preview, then click
ScanGear (scanner driver) to invert the image, then click Scan.
Check 5: The film may be extremely dark or bright, or the spaces between
frames are extremely narrow (2 mm is standard).
Scan again using ScanGear (scanner driver) if the Scanner Buttons or MP Navigator EX yielded less than
satisfactory colors.
Check 6: Adjust the brightness, contrast, tone curve, etc. in Advanced
Mode if the colors of the ScanGear's preview scan was unsatisfactory.
Check 7: Adjust the saturation and color balance on the Advanced Mode
tab of ScanGear (scanner driver) if the scanned image appears reddish or
bluish.
Adjusting Saturation and Color Balance
Check 8: Light may reflect off white slide mounts into images. In that case,
use black slide mounts or cover the white slide mounts with black frames.
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