Canon S450 User Manual page 468

I White Portion Becomes Grayish
Check 1
D
ID YOU PERFORM
Use White Level Calibration to maintain the correct color balance of
scanned images.
Check 2
D
ID YOU ADJUST THE BRIGHTNESS AND CONTRAST
Depending on the image you scan, a white portion is not recognized as
white because the scanner detects and scans even the small differences of
the density between white and other colors.
Adjust the brightness and contrast.
Note
• When you are using IS Scan Plus, use the online Help.
• When you are using a TWAIN-compatible graphics application program,
see the User's Manual for the application program.
W
HITE
Using the White Calibration Sheet
L C
EVEL ALIBRATION
Scanning Result Is Unsatisfactory
?
?
Scanner Problems 468