I have an Epson DX7450 inkjet - it's just one of those multi function A4 devices that I use for quick proofing. I know that the printer is seen by the Mac as an RGB device and that colour mode switching to CMYK is handled by the software. What I want to know is - why is it that when I am printing an image that has been saved from Photoshop in Greyscale mode, when I just print to the Epson using the default settings, it prints out using black AND cyan inks? If I choose to print in black only, that's what it does, but if the original image only contains various shades of black, why does it run down the cyan cartridge as well?