NAME
	crt-calibrator - CRT monitor calibrator utility for Linux VT

SYNOPSIS
	crt-calibrator [FILE]

DESCRIPTION
	crt-calibrator is an interactive tool that guides you through
	calibrating your CRT monitors. When done, the program will
	print gamma-ramp information that is useful when setting
	the calibrations automatically. If FILE is specified, this
	information is stored in the file named FILE.

	The program cannot be run from inside X, it is required that
	it is run from the Linux VT, otherwise known as the TTY.

NOTES
	crt-calibrator should not be used to calibrate LCD (neither
	LED or TFT), plasma monitors, or OLED. It should only be
	used to calibrate monitors with nice gamma-curves, such as
	CRT monitors. Not monitors with sigmoid-curves.

RATIONALE
	Few users have calibration hardware, and CRT monitors can
	be sufficiently calibrated manually without it. However,
	before crt-calibrator the best way to calibrate CRT monitors
	was to use specialised test images, with colour bars and
	samples. But this requires expertise; the common user will not
	know how to construct these images or the best procedure for
	applying the corrections. And it is tedious if you do not
	find any interactive tool for changing the settings.
	The alternative was to use test pictures that relied on you
	deciding what looked most realistic rather than the image
	itself telling you. But that is not all: to my knowledge,
	this is the first program that runs outside a display server.

SEE ALSO
	analyse-gamma(1), blueshift(1)