IMAGE PROCESSING 31 October 2001
6-14
6.4.2 AUTO BACKGROUND CORRECTION
• 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
[A]
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