Abstract
Display devices adopt multiprimary pixels to represent chromatic images, and the individual
primary pixels are discernible dimly within a certain range of spatial frequency. We
systematically investigate the color impression of spatially mixed patterns of two colors from a
barely discernible distance and show that the color impression differs greatly from their
physically averaged colorimetric color. A large degree of luminance-enhanced perception is
observed in all mixed color patterns, and significant chromatically enhanced perception occurs in
the test of mixed monochromatic patterns. The color-enhanced perception inversely depends on
spatial frequency and is not detected at all when the spatial frequency is more than 50 cycles per
degree. However, when the patterns have excessively low spatial frequency, causing the pattern
shape to be clearly recognized instead of being perceived as coarsely mixed color, the
color-enhanced perception is suppressed. The strength of color-enhanced perception also depends on
the contrast and width ratio between two colors, as well as hue value.
© 2014 IEEE
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