The quality of printing of a promotional photo in a white mug is quite high. The image is first printed using special inks on a carrier paper and then transferred to the ceramic mug through intense heat and pressure.
Your photo / image or logo can be printed in all around the outside, (with a 10 mm gap each side of the handle).
The process is quite different in color ceramic mugs, sometimes there are limitations, but this method is much more profitable to get your message.
