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This setting enables you to specify how black and gray data with the equivalent ratio of R to G to B should be processed when device dependent RGB data is converted into device dependent CMYK data using the 'RGB Source Profile' of the machine.

If [On] is selected, black and gray data with the equivalent ratio of R to G to B is printed using the black (K) toner only, regardless of the selected "Output Profile" setting.

If [Off] is selected, black and gray data with the equivalent ratio of R to G to B is printed using CMYK toners based on the selected "Output Profile" setting.

• If you can see gradations or jagged lines in the printouts of black or gray data, select [Off] in RGB Pure Black Process and select [Normal] for 'Output Profile'.

• In combination with certain settings, black and gray data with the equivalent ratio of R to G to B may be printed using the black (K) toner only, even if [Off] is selected. The following are examples.

• When [On] is selected for "Pure Black Text"

• When [None] is selected for "RGB Source Profile"

• When [TR Normal] or [TR Photo] is selected for "Output Profile"

• When "Use 100% GCR Profile" in the printer driver is selected

• If [None] is selected for "RGB Source Profile", the RGB Pure Black Process setting is not applied.

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