264: Thou shall convert all images to CMYK before sending to the printer

Commentary As has been discussed elsewhere in this book, the color printing process uses four colors: cyan, magenta, yellow, and black (CMYK), to reproduce color images and graphics. Many of the image files supplied to you, such as digital photographs, will have been created in RGB (red, green, and blue) mode, which is incompatible with the printing process (RGB-formatted images are used for screen-based graphics such as websites). Before you embark on converting them all, it is a good idea to talk to your printer. Not only is it possible to convert the images to CMYK—you can also add the correct CMYK profile to the images, which will be a great help to the printer, particularly if there are a lot of images. Simply find out which CMYK profile the pr....PD