diff options
Diffstat (limited to 'doc/gamma4scanimage.man')
| -rw-r--r-- | doc/gamma4scanimage.man | 52 |
1 files changed, 34 insertions, 18 deletions
diff --git a/doc/gamma4scanimage.man b/doc/gamma4scanimage.man index 576d148..203c61e 100644 --- a/doc/gamma4scanimage.man +++ b/doc/gamma4scanimage.man @@ -26,41 +26,57 @@ and maximum output value of the gamma table. .PP .BR gamma -is a floating point value, neutral value is 1.0, if the value is larger than -1.0 then the image gets brighter. +is a floating point value, neutral value being 1.0. If the value is larger than +1.0 then the image is brighter. .PP .BR 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. +larger than zero. shadow has to be in the range +.RB "[0.." "maxin" "]." +Its default value is 0. .PP .BR 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). +maxout. highlight must be in the range +.RB "[0.." "maxin" "]" +and +larger than shadow. Its default value is the same as +.B maxin +(16383 if not set). .PP -.BR maxin +.B 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. +If the scanner uses 8 bit gamma input then +.B maxin +must be set to 255, 1023 for 10 +bits, 4095 for 12 bits, and 16383 for 14 bits. The default is 16383. To find +out what value +.B maxin +has to be, call +.BR scanimage (1) +with a very large gamma table +[0]0-[99999]255 and +.BR scanimage (1) +will print an error message with the needed gamma table size. .PP -.BR 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. +.B maxout +defines the maximum output value. Take a look at the output of +.I scanimage \-h +to find out what +.B maxout +must be. The default value is 255. .PP .SH EXAMPLE -.B scanimage \-\-custom\-gamma=yes \-\-gamma\-table -.I `gamma4scanimage 1.8 0 11500 16383 255` +scanimage \-\-custom\-gamma=yes \-\-gamma\-table +`gamma4scanimage 1.8 0 11500 16383 255` >image.pnm .SH SEE ALSO +.BR sane (7), .BR scanimage (1) .SH AUTHOR Oliver Rauch .SH EMAIL-CONTACT -Oliver.Rauch@Rauch-Domain.DE +.I Oliver.Rauch@Rauch-Domain.DE |