Auto Background Correction; Auto Shading; Mtf Filter; Main Scan Enlargement/Reduction - Ricoh JP3000 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.
C238D043.WMF
6-14
31 October 2001