xcalib(1)                   General Commands Manual                  xcalib(1)

NAME
       xcalib v0.12.0 - Monitor Calibration Loader

SYNOPSIS
       xcalib ICC_FILE_NAME
       xcalib -c -d STRING -s NUMBER [-o NUMBER] [-v]
       xcalib -i -d STRING -s NUMBER [-o NUMBER] [-v] [-n] [-p[=FORMAT]] [-l]
       ICC_FILE_NAME | -a
       xcalib -g NUMBER -b NUMBER -k NUMBER -d STRING -s NUMBER [-o NUMBER]
       [-v] [-n] [-p[=FORMAT]] [-l] [-c] ICC_FILE_NAME | -a
       xcalib -R NUMBER -G NUMBER -B NUMBER -d STRING -s NUMBER [-S NUMBER]
       [-T NUMBER] [-H NUMBER] [-I NUMBER] [-C NUMBER] [-D NUMBER] [-o NUMBER]
       [-v] [-n] [-p[=FORMAT]] [-l] [-c] ICC_FILE_NAME | -a
       xcalib -p[=FORMAT] -d STRING -s NUMBER [-o NUMBER] [-v]
       xcalib -h[=synopsis|...] -V --render STRING [-v]

DESCRIPTION
       The tool loads 'vcgt'-tag of ICC profiles to the server using the
       XRandR/XVidMode/GDI Extension in order to load calibrate curves to your
       graphics card.

OPTIONS
   Set basic parameters
       -d|--display STRING host:dpy
       -s|--screen NUMBER  Screen Number
       -o|--output NUMBER  Output Number
              It appears in the order as listed in xrandr tool.
       -a|--alter     Alter Table
              Works according to parameters without ICC Profile.
       -n|--noaction  Do not alter video-LUTs.
              Work's best in conjunction with -v!
       -p|--printramps[=FORMAT] Print Values on stdout.
            -p TEXT        # TEXT
            -p SVG         # SVG
       -l|--loss Print error introduced by applying ramps to stdout.
       -c|--clear     Clear Gamma LUT
              Reset the Video Card Gamma Table (VCGT) to linear values.

   Assign
       xcalib ICC_FILE_NAME
       ICC_FILE_NAME  File Name of a ICC Profile

   Clear
       xcalib -c -d STRING -s NUMBER [-o NUMBER] [-v]
       -c|--clear     Clear Gamma LUT
              Reset the Video Card Gamma Table (VCGT) to linear values.

   Invert
       xcalib -i -d STRING -s NUMBER [-o NUMBER] [-v] [-n] [-p[=FORMAT]] [-l]
       ICC_FILE_NAME | -a
       -i|--invert    Invert the LUT

   Overall Appearance
       xcalib -g NUMBER -b NUMBER -k NUMBER -d STRING -s NUMBER [-o NUMBER]
       [-v] [-n] [-p[=FORMAT]] [-l] [-c] ICC_FILE_NAME | -a
       -g|--gamma NUMBER   Specify Gamma (NUMBER:1 [>=0.1 <=5 <Delta>0.1])
              Global gamma correction value (use 2.2 for WinXP Color Control-
              like behaviour)
       -b|--brightness NUMBER   Specify Lightness Percentage (NUMBER:0 [>=0
       <=99 <Delta>1])
       -k|--contrast NUMBER     Specify Contrast Percentage (NUMBER:100 [>=1
       <=100 <Delta>1])
              Set maximum value relative to brightness.

   Per Channel Appearance
       xcalib -R NUMBER -G NUMBER -B NUMBER -d STRING -s NUMBER [-S NUMBER]
       [-T NUMBER] [-H NUMBER] [-I NUMBER] [-C NUMBER] [-D NUMBER] [-o NUMBER]
       [-v] [-n] [-p[=FORMAT]] [-l] [-c] ICC_FILE_NAME | -a
       -R|--red-gamma NUMBER    Specify Red Gamma  (NUMBER:1 [>=0.1 <=5
       <Delta>0.1])
       -S|--red-brightness NUMBER    Specify Red Brightness Percentage
       (NUMBER:0 [>=0 <=99 <Delta>1])
       -T|--red-contrast NUMBER Specify Red Contrast Percentage (NUMBER:100
       [>=1 <=100 <Delta>1])
              Set maximum value relative to brightness.
       -G|--green-gamma NUMBER  Specify Green Gamma  (NUMBER:1 [>=0.1 <=5
       <Delta>0.1])
       -H|--green-brightness NUMBER  Specify Green Brightness Percentage
       (NUMBER:0 [>=0 <=99 <Delta>1])
       -I|--green-contrast NUMBER    Specify Green Contrast Percentage
       (NUMBER:100 [>=1 <=100 <Delta>1])
              Set maximum value relative to brightness.
       -B|--blue-gamma NUMBER   Specify Blue Gamma  (NUMBER:1 [>=0.1 <=5
       <Delta>0.1])
       -C|--blue-brightness NUMBER   Specify Blue Brightness Percentage
       (NUMBER:0 [>=0 <=99 <Delta>1])
       -D|--blue-contrast NUMBER     Specify Blue Contrast Percentage
       (NUMBER:100 [>=1 <=100 <Delta>1])
              Set maximum value relative to brightness.

   Show
       xcalib -p[=FORMAT] -d STRING -s NUMBER [-o NUMBER] [-v]
       -p|--printramps[=FORMAT] Print Values on stdout.
            -p TEXT        # TEXT
            -p SVG         # SVG

GENERAL OPTIONS
   General options
       xcalib -h[=synopsis|...] -V --render STRING [-v]
       -h|--help[=synopsis|...] Print help text
              Show usage information and hints for the tool.
            -h -      # Full Help : Print help for all groups
            -h synopsis         # Synopsis : List groups - Show all groups
       including syntax
       --render STRING     Render
       -V|--version   Version
       -v|--verbose   Verbose

ENVIRONMENT VARIABLES
       DISPLAY
              Under X11 systems this variable will hold the display name as
              used for the -d and -s option.

EXAMPLES
       Assign the VCGT curves of a ICC profile to a screen
              xcalib -d :0 -s 0 -v profile_with_vcgt_tag.icc

       Reset a screens hardware LUT in order to do a calibration
              xcalib -d :0 -s 0 -c

SEE ALSO
       oyjl-args(1)

AUTHOR
       Stefan Dohla <stefan AT doehla DOT de>
       http://www.etg.e-technik.uni-erlangen.de/web/doe/xcalib/

COPYRIGHT
       Copyright (C) 2013-2026 Kai-Uwe Behrmann
       License: GPL-2.0 https://opensource.org/license/gpl-2.0


User Commands                    15 June 2026                        xcalib(1)