1. A method achieving automatic grainy noise control for optimal macro uniformity appearance, comprising the steps of: determining intrinsic mottle and graininess levels of a device; determining optimal graininess level for the device based on established models; determining additional grainy noise for the device based on a calculated difference between said intrinsic mottle and graininess levels and said optimal graininess levels; and using said additional grainy noise by inputting it into image data.