Acs (Auto Color Selection) - Ricoh A172 Service Manual

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4.2 ACS (AUTO COLOR SELECTION)

*MIN: Also known as "RGB Common Data"

In Auto Color Selection mode, the Black Copy mode or Full Color mode is

automatically selected to match the original image. During the 1st scanning

cycle, the latent image is developed with amount of black toner according to

the corrected R/G/B video signals. If the original does not have any color

area, the 2nd scanning is aborted, and the developed image is transferred

from the transfer belt to copy paper. Then the black and white copy comes

out. If the original has a color area, copying resumes in the full color copy

mode (4 scans).

To recognize if the original has a color area or not, the R/G/B video signals

are compared. If the maximum difference among R/G/B signal levels

(MAX-MIN in the above diagram.) is within a certain range, the original is

considered to be black and white.

This range can be changed by the user.

Black: The range is wider

Color: The range is narrower

Also, the user can select either B/W Priority or Color Priority, to reproduce

the B/W areas or Color areas well, when the ACS mode is selected.

*Factory Setting = Color Priority