The standardizing of coloration for digital imaging is only just coming into its own. The term 'color management' appears to have been universally adopted. The intent is for all input and output devices from all manufacturers, i.e. cameras, monitors, printers, etc., to produce identical color results. (See the International Color Consortium website http://www.color.org). However implementation of the standard is far from finialized. Our most advanced printing lab here in Auckland still relies on the eye for the final product, and probably will for the forseeable future. Granted they mostly work with photographs, where slight skewing of color on skin tones can usually be detected. Whereas on fractal images it's hard to detect but, on the other hand, slight color changes can be tolerated without too much drama. For the record, I don't normally print jpg files; I was using that as an example to show that the Windows color managememt settings can be the source of the problem. If the application program does not handle color management then Windows applies its settings, such as when printing from Windows Explorer. Anyway, the resolution loss arising from jpeg compression would not cause uniform darkening or color shift. Surprisingly, to me anyway, inkjet printers are emerging as the highest quality printing devices and produce the best and longest lasting images. Advances in inks and corresponding papers (they must be used together for the best results!) have brought about paper images that can last up to 200 years in archival settings, and 70 years under normal display conditions -- no direct light, minimal exposure to air (it's the ozone that's the problem). These figures are for the latest Epson products. (See the Wilhelm Image Research webpage http://www.wilhelm-research.com) As mentioned above, your monitor screen can be the source of a color management problem. Without an expensive piece of hardware one cannot calibrate it exactly. However the gamma adjustment (available on most modern screens), as well as contrast and brightness, can be set fairly accurately with a freeware program called Quick Gamma. (See http://quickgamma.de/indexen.html)