"The key to getting first-rate image output on any operating system is setting up a good workflow. One piece of the workflow puzzle that used to be out of reach for Linux users is device profiling--accurately measuring hardware devices like scanners and monitors to account for their differing capabilities. But a relatively young open source application called Lprof does a professional job at that task.
"At good workflow ensures that every stop the image file makes along its journey--scanner, digital camera, editing software, monitor, printer--is a known quantity, so the color management system can apply the correct transformation to the image at each step..."