I-Ping Chen
Center for General Education National Yang-Ming University
Su-Ling Yeh
Department of Psychology National Taiwan University
Color monitors are widely used by experimental psychologists as a major visual display device. There is an inherent nonlinear output property of the monitor that can greatly affect the results of experiments where the intensity level or contrast of the stimuli is of any significance. Measures taken to ameliorate this problem have been generally called “Gamma correction” in engineering fields. The physical cause of such nonlinearity, together with the correction procedures by software to the precision for experimental purposes are discussed in this article. Downloadable software tools and instructions are also provided.
Keywords: Monitor, Gamma correction, video memory, color palette, color lookup table