Minolta Di620, Manual, Page: 45 / 466

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8-4. Image Density Control
1) Auto Density (AE) Control
•
Auto Density Control (AE Control) varies the background removal threshold in
accordance with the original type (newspaper, photograph, etc.). This helps
ensure that only the fogging component in the low-density areas is removed,
while retaining the image density of the characters and other high-density areas
of the image.
•
Unlike correction by analog PPC, the AE control method holds the intensity of the
exposure lamp constant and determines the characteristics of the original by
means of sample data obtained through realtime scanning. The IR Density Cor-
rection Processing section then removes the background components that are
below the threshold.
<Setting of the Density Level>
•
The user can select from three levels (Light, Normal, or Dark) by User Choice set-
ting.
•
Automatic density control (AE control) is effective only if the copier is operating in
Character mode. If the copier is in Photo mode, then only manual density control
is available.
1155M101CA