Epson GT-30000 - Manual (Page 12)

Scanner Settings
8
Advanced Settings dialog box
The Advanced Settings dialog box appears when you click More in the Main Scanner Settings dialog
box. It enables you to control the special features of the scanner.
Note
In some applications, some of the controls described in the previous section,
"Standard Scanner Settings Dialog Box," may instead appear in the Advanced
Settings dialog box.
Threshold
When scanning in Black and White mode, use this control to adjust the gray level in the original document
at which the scanner switches from outputting a white pixel to outputting a black pixel. The Threshold
control is unavailable in color and grayscale scanning modes.
Sharpness
Use this control to sharpen or soften the scanned image, as desired. Use the scroll bar to choose from
among five settings:
•
Defocus
•
Defocus slightly
•
Normal
•
Sharpen slightly
•
Sharpen
Gamma
Gamma is the mapping of one brightness value to another. By default, most scanners map brightness data
evenly over a range of values so that black looks black, white looks white, and values in between have
appropriate brightness or color values. The GT-30000 enables you to adjust the gamma for gray and color
scans. When used with grayscale scanning, gamma correction is used to change the gray level in the