Mtf Filter; Main Scan Enlargement/Reduction - Ricoh C231 Service Manual

IMAGE PROCESSING
6.4.2 AUTO BACKGROUND CORRECTION
[A]
Auto background correction prevents the background of an original from
appearing on copies.
The density of the area [A] (the central 75 mm of the main scan) is the peak
white level density.
This correction can be used in Photo/Letter, Photo, and Tint modes.
6.4.3 AUTO SHADING
Auto shading corrects errors in the signal level for each pixel using the white
plate.

6.4.4 MTF FILTER

The MTF filter enhances the desired image qualities.
The MTF filter is used in all modes (Letter, Letter/Photo, Photo, and Tint).
This model has no SP mode adjustments.

6.4.5 MAIN SCAN ENLARGEMENT/REDUCTION

Changing the scanner speed enables reduction and enlargement in the sub-scan
direction.
The processing for main-scan enlargement/reduction is the same as in the
previous digital machines
The thermal head is 300 dpi, but the CCD is 600 dpi. Therefore, this model
always reduces the amount of scanned data by half before printing.
C231/C237/C238 6-14
C238D043.WMF
SM