The Consistent Presentation of Images (CPI) Integration Profile is a part of the IHE Radiology Technical Framework.

This profile specifies a number of transactions that maintain the consistency of presentation for grayscale images and their presentation state information (including user annotations, shutters, flip/rotate, display area, and zoom). This profile also defines a standard contrast curve, the Grayscale Standard Display Function, against which different types of display and hardcopy output devices can be calibrated. It thus supports hardcopy, softcopy and mixed environments.

Source:  IHE Radiology Technical Framework rev 8.