Canon DR-5020 Instructions Manual page 82
Scanning utility 5000 instructions
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Also See for DR-5020:
- Instructions manual (482 pages) ,
- Quick reference (12 pages) ,
- Brochure & specs (6 pages)
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Chapter 2
Scanning a Document
4
Click [Open]. This sets the gamma curve and returns the display to
the Detail Settings dialog box.
5
To set the gamma curve for other colors, repeat steps 1 to 4.
Preparing Gamma Curve Data
Gamma curve data is stored in a text file (*.gmm) comprising 258 lines. This file
describes the output values for each of the 256 levels of input values.
Be sure to enter a comment in the 1st line of this file, and "256" in the 2nd line of
this file. The 3rd line onwards are for entering each output value for each input
value. Set "0", "1", "2" and so forth from the 3rd line onwards, and "255" for the
input value on the 258th line.
Small values entered for the gamma data curve result in the image being
reproduced dark, and large values result in the image being reproduced light.
Example
Normally, rightward-inclining gamma curves are prepared. However, a leftward-
inclining gamma curve can be prepared by inverting all output values. As a result,
the output image also will be inverted.
Gamma curve data
1st line: gamma curve
2nd line: 256
3rd line: 0
4th line: 1
5th line: 2
|
253th line: 250
254th line: 251
255th line: 252
256th line: 253
257th line: 254
258th line: 255
80
255
Output value
0
(Gamma curve)
255
Input value
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