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IMAGE PROCESSING
Auto shading
Auto shading does two things.
• Zeroes the black level for each scan line of data
• Corrects for variations in white level across the main scan.
Background erase
Output
2 5 5
Input
0
2 0
2 5 5
By default, this process is used only in letter mode and copied original mode.
However, it can be enabled for other modes by SP mode.
Usually, dirty background is erased using the Auto Image Density (ADS) function.
However, sometimes, dirty background areas will still appear. These can be erased
by this function.
If any low image density data which is lower than a threshold level remains after
auto shading, this data will be changed to "0" = white.
The threshold level can be changed with SP4-903-34 ~ 37. For example, for letter
mode, use SP 4-903-34.
A230/A231/A232
SM
2-12
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Troubleshooting
