gamma4scanimage
create a gamma table for scanimage
see also :
scanimage
Synopsis
gamma4scanimage
gamma [shadow [highlight [maxin
[maxout]]]]
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examples
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description
The tool
gamma4scanimage creates a gamma table in the format
expected by scanimage. You can define a gamma, a
shadow and a highlight value. You also can
specify the size (maxin) and maximum output value
(maxout) of the gamma table.
gamma is
a floating point value, neutral value is 1.0, if the value
is larger than 1.0 then the image gets brighter.
shadow
defines the minimum input value that is necessary to create
an output value larger than zero. shadow has to be in the
range [0..maxin]. Its default value is 0.
highlight
defines the maximum input value that produces an output
value smaller than maxout. highlight has to be in the range
[0..maxin], highlight has to be larger than shadow. Its
default value is the same as maxin (16383 if not set).
maxin
defines the size of the gamma table. The size depends on the
scanner/backend. If the scanner uses 8 bits gamma input then
maxin has to be set to 255, for 10 bits 1023, for 12 bits
4095, for 14 bits 16383. The default is 16383. To find out
what value maxin has to be call scanimage with a very large
gamma table [0]0-[99999]255 then scanimage prints an error
message with the needed size of the gamma table.
maxout
defines the maximum output value. Take a look at the output
of scanimage -h to find out what maxout has to be. The
default value is 255.
email-contact
Oliver.Rauch@Rauch-Domain.DE
example
scanimage --custom-gamma=yes --gamma-table
’gamma4scanimage 1.8 0 11500 16383 255’ >image.pnm
see also
scanimage
author
Oliver
Rauch