4inch e-Paper
User Manual
8.3 REFLECTION RATIO
The reflection ratio is expressed as:
R = Reflectance Factor
white board
× ( L
center
/ L
white board
)
Lcenter is the luminance measured at center in a white area (a* ~ b* ~ 0). L
white board
is the
luminance of a standard white board. Both are measured with equivalent illumination source. The
viewing angle shall be no more than 2 degrees.
8.3 DEFINITION OF COLOR PERFORMANCE & SATURATION RATIO
The Spectroradiometer One Pro3 plus was used to measure color image to obtain L*, a*, b*.
Collect L*, a*, b* and then determine the color space.
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