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If good is just not good enough, then you might want to use this tutorial from Linux.com to get your monitor calibrated PERFECTLY.
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. Here's how.
Looks are everything
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. That means, for one thing, that if your monitor resides in a brightly lit neon lamp showroom, calibrating it will result in different settings than the same model used in an unlit basement.
That said, calibration isn't completely individualistic either. Basically, a calibrated display should map an absolute black pixel to the blackest color that it can produce, an absolute white pixel to the whitest color that it can produce, and smoothly scale the shades in between. This task is complicated slightly by the fact that not everybody agrees on what color white is. It is further complicated by the fact that CRTs and LCDs don't generate a linear increase in brightness from a linear increase in voltage, so some math is required to make them paint their signals to the screen correctly.
But calibration really begins before you even touch the monitor. Remember the neon-light showroom? However well you calibrate that monitor, it would look better if you improved the viewing conditions; red and blue ambient light bouncing off the glass interfere with your vision. If you have control over your computing environment, reducing screen glare and using white light bulbs will give you an improvement. I don't generally recommend replacing your lights with special daylight-balanced bulbs, but doing so would help if you must color-match images on your display with other items, such as printouts.
One last word: calibration will not make a bad monitor look like a good one. Calibration is getting optimal performance from a piece of hardware. Finding the optimal hardware is a different issue, and some montiors are just better than others. Almost every monitor has built-in hardware brightness and contrast controls, and most have color temperature control as well. If your hardware doesn't have these controls or they are malfunctioning, calibration won't make up the difference. Full tutorial
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