“The world was not wheeling anymore. It was just very clear and bright and inclined to blur at the edges.”
There is more involved in making an image than simply portraying objects. Part of making an image appear photorealistic is having it look like a photo. Just as a photographer adjusts their final result, we may also wish to modify, say, the color balance. Adding film grain, vignetting, and other subtle changes to the rendered image can make a rendering look more convincing. Alternately, more dramatic effects such as lens flares and bloom can convey a sense of drama. Portraying depth of field and motion blur can increase realism and be used for artistic effect.
The GPU can be used to efficiently ...