Canon iRC2100 Printing Manual page 94

A
A-20 Print Options
Toner Reduction
Color mixtures with high toner values can cause a blasting effect on the
printed page. Blasting occurs when excess amounts of toner, combined with
certain types of paper stock, result in a printed image "blasting" beyond its
boundaries, as defined on your computer screen.
The Toner Reduction option minimizes this effect by reducing high toner
values to a maximum of 210%. For example, if a color image in your job calls
for toner values of C 100%, M 50%, Y 100%, and K 10% (for a total toner
value of 260%), setting Toner Reduction to On automatically adjusts those
CMYK values to create the same color with a maximum toner value of 210%.
When set to Off, the iR C2100/2100S prints with the amount of toner
specified.