600 Dpi And 1200 Dpi Scan Modes - Contex XD2490 Service Manual

600 dpi and 1200 dpi scan modes

The CIS module is able to scan in binning mode. When scanning resolution between 1200 and 600 dpi,
it uses the 1200 dpi scan mode. When scanning at 600 dpi or below, it uses 600 dpi binning mode. That
means that it uses information from adjacent pixels in order to minimize noise. Because of these two
modes, it requires a calibration for both 1200 dpi and 600 dpi. In this way we get the benefit on 600 dpi
scans by having a 1200 dpi CIS module.
Appendix A
Test 20. Noise Test
This test is very useful if there are
image quality issues such as streaks
throughout the scan (scan direction).
It can be determined if the streaks are:
dust that are
1) present in the scanner (Dark streak
that goes below the average line)
2) it has been present during Scanner
Maintenance (White streak that goes
above the average line)
Insert Sm calibration sheet when
asked.
If the DPI is changed it requires a
rescan. See note, B-5 .
Test 21. Scan Dump
Will create a still picture of what the
CIS elements is looking at.
The generated SCANdump.con can
extracted and view with SCANtest
installed.
SCANdump is a very use full tool
when a problem is being escalated to
support.
A-5