Canon MP630 SERIES On-Screen Manual page 27

Making Copies
If you select Fast (speed-priority) with the media type set to Plain paper and the quality is not
as good as expected, select Standard or High(quality-priority) and then try copying again.
When you make black & white copies by pressing the Black button, select High(quality-
priority) for the print quality to copy in grayscale. Grayscale renders tones in a range of grays
instead of black or white.
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