Used to create Camera networks. Accepts color, opacity, and Alpha. Applied by camera as drawn to bucket but before drawn to screen. Imager cameras can be used to perform special effects processing, to compensate for nonlinearities in the display media, and to convert to device dependent color spaces (such as CMYK or pseudocolor). Imagers can also be used to specify the type of output generated, e.g. to a file rather than the screen.