The use of soft-copy displays to simulate printing devices is a common practice in the color imaging community. CRT and LCD displays can be used as a means of proofing hardcopy prints, and can also be used as tools for the development and evaluation of future imaging systems. Desktop display devices are typically of a much lower resolution than most printers, which can make it difficult to evaluate the spatial structure of prints such as the perceptibility of half-tone dots or graininess. To evaluate these spatial properties one common practice is to use a larger soft-copy display viewed further away. A psychophysical study was performed to determine the influence of this increase in viewing distance on perceived spatial frequency and contrast. Observers were asked to match the appearance of band- passed noise patterns between two displays viewed at different distances by adjusting spatial frequency and contrast. The results indicate that observers perceive a higher spatial frequency in the far image as a match the appearance of the closer image. Therefore, when a near and far object have identical spatial frequencies, the far image is perceived at a lower spatial frequency. This suggests that the overall visibility of spatial structure cannot be modeled by simple retinal frequencies.
Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
Thirteenth Color Imaging Conference (2005) 339-343
RIT – Main Campus