Hi! I'm very new to this, and i've been reading extensively on how to use argyll with my colormunki photo. I need to properly profile my epson stylus pro 7800 to do prepress color proofs, and to do so i followed the instructions to profile a CMYK printer (I am using printfab to print directly from CMYK, please correct me if using this kind of RIP is appropriate or unnecessary). I printed a 630 patch test, scanned them and created a profile using a GRACoL standard profile for the matching. The result was pretty awful: The colors are very wrong, and the profile is just unusable. All i can tell is that the avg error when creating the profile was 2.x, and the max. error was 25 (pretty high apparently). Can i get some feedback to figure out where i couldn't gone wrong? Thank you SO much. Best regards from Chile -- R. Villanueva