One thing I believe helps me get the results I see on screen when a job is printed is to work in the CMYK color space to begin with when starting a design job that includes images. Before I start adding or changing color or adding elements, I’ll switch to CMYK Preview mode in Photoshop. This gives me the added bonus of being able to use all of Photoshop’s editing and filter features that are only available in RGB mode. By doing this, I know what my image is going to look like when it’s converted to CMYK before printing. If you forget to switch to CMYK, or at least use the CMYK Preview mode, you run the risk of falling in love with the beautiful vivid color in your image, only to see it washed out and flat when printed.