"A lot of Linux users seem resigned to the notion that the X
Window System is a second-class citizen in the calibration world.
They couldn't be more wrong. Just as Linux allows you the
flexibility to hand-tune your kernel configuration and optimize
your disk drive performance to the manufacturer's limits, you can
calibrate your monitor with enough precision to satisfy the pros.
"To begin with, understand that all display calibration has one
goal: appearing correct to your eye. An image--whether it's a JPEG
file or a live video feed--is a big matrix of pixel values. The job
of the computer monitor is to map those pixels to glowing dots that
look right to you..."