Liu Research Laboratories, LLC
_______________________________________________________________________________________
|
|
|
|
This Laboratory mainly provide consultant services including color imaging algorithm development, spectral color matching, color matching of dyeing and paint, fluorescent color matching, color measurement of gemstones, and instrumental color grading of pearls and colored stones. We have developed several types of daylight sources and display light sources using incandescent lamps and colored glass filters. Currently we provide colored glass filters and attachments for MR16 and MR11 incandescent lamps. We are doing research projects in the field of color vision, including the systematic color vision theory, negative feedback control of the visual system, chromatic adaptation, and lightness adaptation. Spectral Matching of Color A spectral reflectance modified Neugebauer theory was developed by Liu(1991). This theory uses the equivalent spectral reflectance(ESR) to represent the optical effects of a ink layer. It can predict the thinknesses or the dot area ratios of the primary printing colors. A target color is best matched wavelength by wavelength. This theory was tested using the 3M Matchprint proof. The spectral reflectances of the proof colors match that of sample color very well. This theory can be directly used to any color materials for different types of printers, since the spectra of target colors are matched by that of the primary colors. Liu, Y(1991) Spectral reflectance modification of Neugebauer equations, TAGA Proceedings, pp. 154-172. Standard CIE Daylight Simulators We have developed a series of standard CIE daylight simulators:D50, D55, D65, and D75. The colorimetric specifications are: Metamerism Index in visible range (MIvis): B or better Color Rendering Index (RI): > 95 (about 97) The specifications of our daylight simulators can meet all of the US and international standard on daylight simulators. Alexandrite Effect Sample Set Alexandrite effect refers to color change under different light sources. This effect is a non-color-constancy phenomenon. It is classified into four types based on the pair of illuminants used to produce the color changes. Our Alexandrite Effect Sample Set contains two samples to represent the two most important types: type 1 and type 2. The category 1 sample is a synthetic alexandrite which shows a greenish blue color under an daylight or a fluorescent light, and reddish purple under an incandescent light. The category 2 sample may be a synthetic sapphire, garnet, or colored glasses. It shows similar color under daylight and incandescent light, but differs under a fluorescent light. This Alexandrite Effect Sample Set is for color science research, vision science research, psychophysics research, color education, gem trade, and collection.
|
|
Copyright © 2003 Liu Research Laboratories, LLC,
2202 Seaman Avenue, South El Monte, CA 91733.
|