Canon LBP7780CX User Manual page 620

2]
Smoothing]
[Graphics]
[On]
[Text]
[Grayscale [sRGB], [NTSC],
*
[Uniform RGB]
Conversion]
process that provides more smoothing.
*
: [Off],
You can select what to smooth by switching [Graphics] and [Text]:
[On]/[Off].
*
: [Off], [On]
Select the method for converting color print data to grayscale for
printing.
When it is set to [sRGB], it calculates the grayscale value using
the sRGB standard color conversion method.
When it is set to [NTSC], it calculates the grayscale value using
the NTSC standard color conversion method.
When it is set to [Uniform RGB], it takes the average value of
the Red, Green and Blue color values as the grayscale value.
If [Color Mode] is set as [Auto (Color/Black)] and [Color], the
setting for this item becomes invalid.