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When "Download Pattern" is selected, the above dialog box opens.
Select the gamma pattern download file to be used from the list of file names. Then, press
the [OK] button. Correction will then be executed using the selected gamma pattern.
If the gamma pattern download file has not been registered in the list of file names, use the
[Add] button to register the file.
See "Download Pattern File" for information about how to specify the file.
When "Custom" is selected, a custom specification can be entered.
Entering an arbitrary value between 0.1 and 10.0 enables a gamma pattern corresponding to
the entered value to be specified.
♦ White Level Follower
Select this option to scan a document whose background color is not white, such as a
newspaper.
Select "Auto", "Enable", or "Disable".
When "Enable" is selected, the document is scanned using background follow-up (for line
drawings). When "Disable" is selected, the document is scanned using the standard basic
white background (for photographs). When "Auto" is selected, the option automatically
switches to the optimal setting based on the specified "Image Mode".
"White Level Follower" is used to adjust the density of the white background of a document
and correct variations in the background color by compensating the pixels of scanned images
individually.
For ordinary use, set "White Level Follower" to off. Use of "White Level Follower" often
increases the background noise because IPC-3/3D is very sensitive.
This option is not available if "Gray Scale" is selected for "Image Mode".
In addition, some scanner models do not support this option. See "Relevant Image Scanner
Specification" in the Appendix.