gcm-calibrate man page doesn't document main option(s)
$ gcm-calibrate -h
Usage:
gcm-calibrate [OPTION…] gnome-color-manager calibration tool
Help Options:
-h, --help Show help options
--help-all Show all help options
--help-gtk Show GTK+ Options
Application Options:
-p, --parent-window Set the parent window to make this modal
-d, --device Set the specific device to calibrate
-v, --verbose Show debugging information for all files
--display=DISPLAY X display to use
$ man gcm-calibrate
...
NAME
gcm-calibrate - GNOME Color Manager Calibrator Tool
SYNOPSIS
gcm-calibrate [ --verbose ]
DESCRIPTION
This manual page documents briefly the gcm-calibrate command.
gcm-calibrate allows you calibrate devices.
SEE ALSO
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Originally reported at https://bugzilla.gnome.org/show_bug.cgi?id=790532