Rendering is a combination of the technical and the artistic.
Basically artistic is images which contains media image or video in the digital format when we do the analysis through computers or desktop.
Further on the images or video we need a set of computer program to do the more analysis for our specific outcome this is term is called rendering.
It is combination of both artistic and technical.
Mostly these methods are used for medical report for patient to do further analysis to care out for future treatment.
Even bio metric images are used on this methods.