Imag E D ELIVE R Y Commercial Digital Pressesarebecominganincreas- ingly common adjunct to offset presses in the com- mercialprintworld.Sincetheyaremucheasiertoset upandrunthanoffsetpresses,theyareidealforshort runs and print-on-demand applications. In general, they print with a linescreen equivalent of around 200 DPI. Most printers recommend 300 PPI resolu- tionfilesforinput,althoughanythingabove200 PPI isquitesafe.Dependingontheimage,youmayseea smoothertoneasaresultofresolutionupto400 PPI. Color Profiles Inkjets, continuous-tone printers, and commercial digitalpressescanallbeprofiled.Inaddition,theycan be used with raster image processors (RIPs), which usually provideameans tocalibrateaswell as profile asanarcaneprocessrequiring$50,000drumscanners, specialized RIP software, and printers who treat the whole process like it was their own version of the original Coke recipe. Meanwhile, many design direc- tors blithely push the "convert to profile" button withoutasecondthought.Thetruthissomewherein between.GoodRGBtoCMYKconversionisbothan art and a science, but it is not rocket science. We highly recommend Rick McCleary's CMYK 2.0 (Peachpit2009)asagoodguidetothisprocess,aswell as the Adobe white papers by Bruce Fraser and Jeff Schewe,www.adobe.com/digitalimag/ps_pro_primers. HTML. The big difference between preparing image files for RGBoutputversusCMYKoutputisthattheCMYK colormodehasamuchsmallergamut(rangeofpos-