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Gamma download pattern file
Any user defined gamma correction processing can be performed by downloading the
pattern from the gamma download file to the scanner. The defined pattern becomes
effective when [Download Pattern] is selected for [Gamma Pattern].
Some models do not support this file. See "Relevant Image Scanner Specification" in
Appendix.
Although the standard extension of the file name is ".GMA," there may be exceptions
Creation of a gamma download pattern file can be facilitated using the following utilities for
editing the gamma correction pattern:
Coding configuration:
(gray-scale in the X direction),(gray-scale in the Y direction),
(X0 output value),(X1 output value),(X2 output value),........
(X253 output value),(X254 output value),(X255 output value)
Meaning of each element:
(gray-scale in the X direction) indicates the size and the gray scale of the input value.
(In this driver, this value is fixed at 256.)
(gray-scale in the Y direction) indicates the size and the gray scale of the output value.
(In this driver, this value is fixed at 256.)
(Xx output value) indicates the output value, in the range of 0 (bright) to 255 (dark), for
an input value x.
Note
Use a delimiter other than a number to delimit elements. For most cases, use a
comma (,).