Canon S400 User Manual page 464

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The colors displayed on your display may not match the actual scanned
colors.
Color Matching attains the best match between the colors displayed on
your display and the actual colors in the scanned image.
You can enable Color Matching when the Scanning Mode is set for Color.
Windows
Check that Color Matching is enabled.
Click the Custom Setting button.
1
Make sure that Color Matching is enabled in the Custom Setting dialog box.
2
Macintosh
Select Settings from the Menu screen.
1
Make sure that Color Matching is enabled.
2
M
OLOR ATCHING ENABLED
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Scanning Result Is Unsatisfactory
Scanner Problems 464