Canon LBP7780CX User Manual page 615

[Pure Black Text] [Off], [On]
*
[Off], [On]
[Black Overprint]
[Brightness] 85 to 100 to 115%
[Halftones]
[Error Diffusion] [Off], [On]
[Text]: [Resolution],
[Gradation]
[Graphics]:
[Resolution/Grad.] [Resolution],
[Gradation]
[Image]: [Resolution],
[Gradation]
[CMYK Overprint] [Off], [On]
If [CMYK Sim. Profile] is set as [None], the setting for this
item becomes invalid.
Set how to print black (R=G=B=0% and C=M=Y=100%/BK=N% or
C=M=Y=0%/Bk=100%) text.
When it is set to [On], it prints data for black colors created by
applications using only 100% black toner. The text is never
printed with color toner slurring around the edges.
When it is set to [Off], it prints black text according to the
selected [Output Profile] setting.
Set how to print black (R=G=B=0% and C=M=Y=100%/BK=N% or
C=M=Y=0%/Bk=100%) text.
When it is set to [On], if black text is on a colored background,
there is never a white rim around the edges of the text, so that
the black text is not printed set out from the background with
white edges.
When it is set to [Off], if black text is on a colored background,
after the black text is printed set out from the background with
white edges, black text is printed on the white edges. The print
may be fainter than the print result if it were set to [On], and
the edges of the text may be rimmed with white.
You can adjust the brightness of the whole image. You can use this
setting to set from 85 to115% at intervals of 5%. The smaller the
value the brighter it becomes. The larger the value the darker it
becomes.
Specify the halftone display method when printing. When [Error
Diffusion] is set to [On], it uses error diffusion that excels at subtle
expression of text and fine lines. It is suitable for printing small text or
particularly fine lines.
When [Error Diffusion] is set to [Off], you can select the halftone
display method from [Resolution] and [Gradation] using
[Resolution/Grad.].
When it is set to [On], it uses the printer's "Grayscale Profile" to
convert it to CMYK data. However, it may be reproduced using
black (Bk) toner only, by using the [Output Profile] or [Pure
Black Text] settings.
When it is set to [Off], it is reproduced using black (Bk) toner
only.
You can overprint device-dependent CMYK data as composite
output. Since all the colors used in the data are overprinted to a
single palette, you can check the result without performing color
separation.
If [CMYK Sim. Profile] is set as a value other than [None], the