Canon PIXMA MP450 User Manual page 117

Scan Quality Is Poor (Poor Image Displayed On The Monitor)
Cause
Incorrect scan settings.
Specification of the application
program.
Moiré appears.
Inappropriate display settings.
Dirty Platen Glass or Document
Cover.
The status of the original is poor.
Parts Of Image Missing Or Surrounded By Extra White Areas
Cause
Scan area was specified larger than
the original.
Chapter 11
Rescan with adjusted settings. (See the Scan Guide)
Some application programs do not display the image clearly if the image
is too small. Set the view mode to 100%.
Select [Magazine (Color)] for Select Source in the Simple Mode or turn on
the [Descreen] option in the Advanced Mode of ScanGear MP. Turn off the
[Unsharp Mask] function if the moiré effect is still too strong even when
the Descreen option is on. (See the Scan Guide)
Set the display settings on your computer to Medium (16 bit) or higher.
In the [System Preferences] dialog, click the [Displays] icon and select the
[Display] tab. Set the [Colors] list box to [Thousands] or a higher setting.
Clean the Platen Glass or the Document Cover of the machine, taking
special care not to press strongly on the Platen Glass.
Scan with certain functions such as Remove Dust and Scratches, Fading
Correction or Grain Correction in the Image Settings section of the
Advanced Mode of ScanGear MP.
Note
If the printout of an image does not appear satisfactory or the same as
what you see on the monitor, you may need to change the machine's
settings, or the machine itself may have some problems.
Specify the scan area appropriately.
If you click the Auto crop button of the ScanGear MP, the scan area is
adjusted autmatically to match the size of the original. When scanning an
original surrounded by white borders such as a photo print, of if you
otherwise want to specify a custom scan area, specify the scan area
manually. Refer to the Scan Guide for details on manual scan area
specification.
Action
Action
Troubleshooting
115