Canon Laser Shot LBP5970 User Manual page 463

Gradation in the black or gray parts of the image does not appear smooth (the color
changes stand out).
Cause
Remedy
IMPORTANT
When printing is performed with the setting for RGB PURE BLACK set to OFF, data in
black or gray is printed with 4-color toner of CMYK. Therefore, the data may be printed in
color, even if all the pages are in black and white.
Gray data appears grainy.
Cause
Remedy
IMPORTANT
7
When printing is performed with the setting for RGB PURE BLACK set to OFF, data in
black or gray is printed with 4-color toner of CMYK. Therefore, the data may be printed in
color, even if all the pages are in black and white.
7-68 When You Cannot Obtain Appropriate Printout Results
Data in black or gray was printed with the setting for RGB PURE BLACK
enabled.
Set RGB PURE BLACK (See p. 5-98) in the PS options to OFF.
Also, you can specify the same setting in the PS printer driver. For more details,
see Help of the PS printer driver.
Data in black or gray was printed with the settings for RGB PURE BLACK
and OUTPUT PROFILE enabled.
Set RGB PURE BLACK (See p. 5-98) to OFF, then set OUTPUT PROFILE (See
p. 5-97) to NORMAL in the PS options.