with line art that has been damaged through JPEG compression, may consider posterizing the image as a first step to remove artifacts on the edges of the image. Posterizing time Temporal posterization is the visual effect of reducing the number of frames of video, while not reducing the total time it takes the video to play. This compares to regular posterization, where the number of individual color variations is reduced, while the overall range of colors is not. The motion effect is similar to the effect of a flashing strobe light, but without the contrast of bright and dark. Unlike a pulldown, the unused frames are simply discarded, and it is intended to be apparent (longer than the persistence of vision that video and motion pictures normally depend on). An animated GIF often looks posterized because of its normally-low frame rate. More formally, this is downsampling in the time dimension, as it is reducing the resolution (precision of the input), not the bit rate (precision of the output, as in posterization). The resulting stop-go motion is a temporal form of jaggies; formally, a form of aliasing. This effect may be the intention, but to reduce the frame rate without introducing this effect, one may use temporal anti-aliasing, which yields motion blur. Compare with time stretching, which adds frames. See also Downsampling Quantization error Discretization error Color quantization Level-set method References Langford, Michael. The Darkroom Handbook. New York: Dorling Kindersley Limited, 1981. 245-249. Jasc Software. Paint Shop Pro Help, 1998. External links https://web.archive.org/web/20060106051841/http://desktoppub.about.com/cs/graphicstips/f/posterization.htm https://web.archive.org/web/20060202015057/http://www.sphoto.com/techinfo/wdtech.html Artistic techniques Posters Computer graphic artifacts Digital photography