Canon MF419x User Manual page 307

You can select the printing method to reproduce halftones (the intermediate range between the lighter and
darker areas of an image) for optimal image quality. Tap <Gradation> or <Error Diffusion>.
<Gradation>
Prints images with fine gradation, such as digital camera images, with a smooth finish.
<Error Diffusion>
Prints images with small text or fine lines with a clear finish.
<Grayscale Conversion>
You can select ways to convert color values to a grayscale value when you print color print data.
<sRGB>
Color data is converted to monochrome with emphasis on color differences so that a smooth gradation is
achieved.
<NTSC>
Color data is converted to monochrome so that the resulting image looks like a television picture (of the
NTSC system).
<Uniform RGB>
Color data is converted to monochrome so that R, G, and B are uniformly converted to the same gray level.
<Set PDF Details>
Specify the default settings of the memory media print function only for PDF files.
Using the Machine as a Printer
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