The term post-production refers to a very thorny subject: there is no logic or standard procedure applicable to any case, but each image requires a different analysis and therefore, depending on the result we want to, obtain, various processes are requested. The Rendering never gives us an image ready to be considered final but it represents the starting point for this further phase. The main photo-editing softwares allow us to give the image that particular atmosphere that in a single rendering phase can not be obtained and which helps to increase that level of photorealism required.