It is now possible to fully calibrate a monitor for Linux! The catch is that you still need Windows to run the hardware calibrator. I am writing this in the light of the recent thread here which was concerned with monitor calibration on UNIX. Don E there suggested (thanks Don!) that I run Gretag Macbeth's EyeOne Match on Windows, and then load the resulting profile on Linux with xcalib. Today I did just that, and it worked magnificently! Xcalib is "postcardware," so I am just about to send a postcard to Stefan Doehla who wrote the program. Current versions of Xcalib may not work with all ATI card/driver combinations (I used an NVIDIA card and everything went fine). But even if Xcalib does not work on your machine, it is still useful to run the monitor through the hardware calibration procedure, because it will ensure your monitor is set to the desired temperature, has the desired gamma, and has more or less proper gray tone reproduction. Also, Cinepaint and some other programs (Bibble, UFRaw, and Scribus come to mind) which support color management on Linux will be able to use the produced profile. With my Philips aperture-grill CRT, I almost didn't need a profile at all after the EyeOne calibration, as can be seen from the upper data sheet below. With LCDs things are a bit more tricky. On the bottom, for a comparison, is a Dell 1703FP (Samsung PVA panel) data sheet. Notice how the color reproduction curves diverge on the bottom (LCD) data sheet -- if I fiddled even more with the on-screen buttons I probably could have have gotten the curves a bit closer together, but I'm too lazy for that. With the CRT I didn't need to adjust the color controls at all, and just used a "Photoretouching" preset (~5800K, although described as 5500K).