直接渲染图都必须经过渲染后期处理，才能更为完美生动地表现产品的设计意图，在产品细节无法通过三维技术来表达，或用三维表达比较复杂或三维数据量比较大的情况下都通过平面的后期处理得以实现。比如产品表面的特殊肌理，产品表面的logo和文字，渲染中的计算错误，包括某些表面的光影关系都需要在平面软件中更正。Play up and must deal with later stage to pursue through playing up directly, could display the design intention of the products vividly for the perfection , it is unable to express through three-dimensional technology in the detail of the products, or greater situation is all dealt with through the later stage of the level and can be realized the amount of more complicated or more three-dimensional data expressed of the three-dimension. The superficial special skin texture such as the products, logo and characters on the products surface, the mistake in computation while playing up, including some superficial mere shadow relations all need correcting in the level software

1.  渲染初稿 The source rendering