Geert, > I noticed there is also a more expensive edition, Design LT. The > difference seems to be that the Design LT can be used for profiling > CYMK printers (in "limited mode" whatever that may mean limited mode means here that X-Rite only allows to create a profile based on a _very_ small target (45 colors for the RGB, dunno how few colors for CMYK). > Is this a limitation of the included spectrometer, or just the > software bundled with it You get a key which is loaded into the EyeOne. This works as a dongle and tells the software which options it opens for the user. If you use Argyll the difference won't matter -- buy the Photo LT version. > I am asking because I don't know which one I should buy for my > printer. My Epson Stylus Photo 950 is a 6-color inkjet printer > (Cyan, Light-Cyan, Magenta, Light-Magenta, Yellow and Black). I > would assume then that the printer is a CMYK printer. All printers print with subtractive colors, but if you're not using a RIP but the default drivers you will send RGB data to the printer. So in this sense your printer is a RGB printer, although it uses CMYK (or more) colors. > Also, I believe I read in the Argyll CMS documentation that what > really matters is the Driver's color space, whether the driver > expects CMYK or RGB input. Or did I misunderstand ? No, you did not misunderstand. > I am using the Gutenprint drivers on linux for my printer. And I > think this driver works in the CMYK color space, because I can tweak > various cmyk density options in the advanced driver settings. But I > don't know for sure. Anyone else know this ? I don't use Linux and leave this question for someone else to answer. I guess that you just can alter some parameters which are offered in CMY mode, but still the printer is accessed like an RGB device? > One more question here. The Argyll documentation mentions that it > can only profile three color CMYK, but my printer appears to use > five. Does that mean I can't profile this printer with Argyll ? No, you don't access the printer colors direct, but send RGB data to the printer. The conversion from RGB to the printer colors is done inside the printer(driver). Best regards Peter