Human image synthesis is like a game of 'make-believe'. It is a computer process that can create realistic-looking human images from scratch. A computer program is used to generate an image of a person by using a set of instructions and tools. These instructions tell the computer what elements to use and how to combine them to create a realistic-looking picture. For example, the program can use shapes, colors, shadows and lighting to create a person's face, hair, and skin. The end result is a realistic-looking image that looks just like a real person.