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.\" Copyright 1999 by The XFree86 Project, Inc.
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.\"
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.\" All Rights Reserved.
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of The XFree86 Project shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from The XFree86 Project.
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.\"
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.TH xgamma 1 __vendorversion__
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.SH NAME
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xgamma - Alter a monitor's gamma correction through the X server
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.SH SYNOPSIS
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.B "xgamma"
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[-display \fIdisplay\fP] [-screen \fIscreen\fP] [-quiet]
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[-gamma f.f | [[-rgamma f.f] [-ggamma f.f] [-bgamma f.f]]]
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.SH DESCRIPTION
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.PP
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.B xgamma
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allows X users to query and alter the gamma correction of a monitor via
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the X video mode extension (XFree86-VidModeExtension).
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.PP
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Note that the \fBxgamma\fP utility is obsolete and deficient, \fBxrandr\fP
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should be used with drivers that support the \fBXRandr\fP extension.
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.PP
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If no value for the gamma correction is given via the
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.I -gamma
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or
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.IR -rgamma / -ggamma / -bgamma
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options,
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.B xgamma
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prints the current gamma correction of the display.
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.SH OPTIONS
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.PP
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.TP 8
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.B "-display \fIdisplay\fP"
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This argument allows you to specify the server to connect to; see \fIX(__miscmansuffix__)\fP.
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.PP
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.TP 8
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.B "-screen \fIscreen\fP"
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When multiple displays are configured as a single logical display, this option
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allows you to select the screen you wish to change.
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.PP
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.TP 8
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.B "-quiet"
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Silence the normal output of
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.B xgamma
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.PP
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.TP 8
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.B "-help"
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Print out the `Usage:' command syntax summary.
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.PP
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.TP 8
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.B "-gamma f.f"
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The gamma correction can either be defined as a single value, or
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separately for the red, green and blue components. This argument
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specifies the gamma correction as a single value.
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.PP
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.TP 8
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.B "-rgamma f.f"
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This argument specifies the red component of the gamma correction.
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.PP
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.TP 8
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.B "-ggamma f.f"
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This argument specifies the green component of the gamma correction.
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.PP
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.TP 8
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.B "-bgamma f.f"
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This argument specifies the blue component of the gamma correction.
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.SH ENVIRONMENT
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.PP
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.TP 8
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.B DISPLAY
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To get default host and display number.
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.SH BUGS
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.PP
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This client changes the internal values of the gamma correction for the
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Xserver. Whether or not these values are respected depends on the video
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drivers.
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.PP
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The gamma values are passed to the Xserver with 3 decimal places of
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accuracy.
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.SH SEE ALSO
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xvidtune(__appmansuffix__),
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xrandr(__appmansuffix__)
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.SH AUTHORS
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Kaleb S. Keithley, X Consortium.
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.br
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David Dawes, David Bateman
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