Alpha Dithering to Correct Low-Opacity 8 Bit Compositing Errors

Williams, P L ; Frank, R J ; LaMar, E C

Lawrence Livermore National Laboratory

关键词: 99;    Computer Graphics;    Corrections;    Computer Calculations;    Opacity;   

DOI  :  10.2172/15004537
RP-ID  :  UCRL-ID-153185
RP-ID  :  W-7405-ENG-48
RP-ID  :  15004537

美国|英语

来源: UNT Digital Library

【 摘 要 】

This paper describes and analyzes a dithering technique for accurately specifying small values of opacity ({alpha}) that would normally not be possible because of the limited number of bits available in the alpha channel of graphics hardware. This dithering technique addresses problems related to compositing numerous low-opacity semitransparent polygons to create volumetric effects with graphics hardware. The paper also describes the causes and a possible solution to artifacts that arise from parallel or distributed volume rendering using bricking on multiple GPU's.