Service manual

1.8.7 Color Correction
The color correction function can operate only when the scanner is in color line sequence mode, under which
pixel color is determined immediately upon scanning. Four color-correction settings are provided. To disable
color correction, select either color page sequence reading or monochrome reading.
This color-correction function processes image data to achieve optimal conformance with the characteristics
of the color output device being used. CRTs, for example, create colors by combining the additive primary
colors (green, red, and blue). In contrast, printers use subtractive primary colors (magenta, cyan, and yellow).
Printers may also add an additional block to increase the definition. For printers, colors may also vary
according to the printing method or ink type.
CRT Displays
This setting provides color compensation to match the characteristics of color CRT displays.
Impact Dot Matrix Printers
This setting provides color compensation to match the characteristics of impact dot-matrix color printers.
Thermal Transfer Printers
This setting provides color compensation to match the characteristics of thermal-transfer color printers.
Ink-Jet Printers
This setting provides color compensation to match the characteristics of ink-jet color printers.
1.8.8 Brightness
The scanner enables you to choose one of seven brightness levels for scanning. The center setting is the
normal one.
Darker settings are appropriate for line art and for faint original images; use lighter settings when the original
image is dark. Brightness can be set independently of other functions.
The following graph shows the differences between brightness settings when the gamma correction is set to
CRT display A.
1.8.9 Sharpness
This function allows you to adjust the sharpness of the image. You can choose normal level, two sharpness
levels (strong and weak), and two defocusing levels (strong and weak).
Darker
Image Input
Data Output
Lighter
Lighter
Darkest Setting
Lightest Setting
Normal (Center)
Figure 1-18. Brightness
GT-5000 / Action Scanner II Service Manual Product Description
Rev. A 1-23