I want an image of 50x40 (high) cm sending to a lab. The frame should be 5 cm at all sides. Is this the way? Use Print at Lightroom 5. Choose printing and JPEG. Under Custom File Dimension write 50x40 cm where 40 is high. Write 5 cm at all sides under Margins to get the frame. Let the Print adjustment emty.Print sharp=Standard. And choose 300 dpi.