Orange and green are primarily required to match PMS colors in the graphic design industry. I used to offer fine art repro services, I rarely, if ever, detected a difference between the output of the 9900 and 9890 printers. I have yet to see a difference when printing pictures from medium format all the way down to iPhone files. I had a 9900 that went kaput on me. The orange ink, so rarely used, clogged up to the point where I ran nozzle checks every day to keep the head free and clear. If you are printing photographs and are not matching colors for graphic design, save yourself the trouble and get the 9890. It's a pleasure to not have to buy unnecessary ink carts.