Testing Chromatic-Adaptation Models Under the guidance of Mark D. Fairchild, MCSL has been conducting a series of experiments to test the effectiveness of chromatic adaptation and color appearance models in many situations. For my Color Science M.S. thesis, I have focused on testing chromatic adaptation models with simple field, printed object colors. I examined the performance of the CIELAB, ...

METHODS: Patients with senile monocular cataract were randomly assigned to receive either a blue light-filtering aspheric IOL (Aspira-aAY group), its clear aspheric counterpart (Aspira-aA group) or the clear spherical model (AS group). The primary outcome measures were visual acuity for distance, intermediate (1 m), near (40 cm), contrast sensitivity under photopic (85 cd2) and mesopic (3 cd2) ...

Digging by gophers disturbs near-surface soils, deposits sediment in mounds and “eskers” in non-uniform surface patterns, and affects surface penetrability of soils at alpine treeline. Soil samples were collected and soil compaction was measured at three sites in the Culebra Range of the Sangre de Cristo Mountains in southern Colorado, to determine the effects of gophers on surface compaction a...

Validation procedures are described for 12 chemical spot tests including cobalt thiocyanate, Dille-Koppanyi, Duquenois-Levine, Mandelin, Marquis, nitric acid, para-dimethylaminobenzaldehyde, ferric chloride, Froehde, Mecke, Zwikker and Simon's (nitroprusside). The validation procedures include specificity and limit of detection. Depending on the specificity of each color test, between 28 to 45 ...

Value, chroma, and hue of gingiva of 100 black and 100 white patients were measured clinically with Munsell color tabs under fluorescent light and under simulated daylight. The color of uniformly pigmented attached gingiva of both blacks and whites was described most often by a value between 5/ and 7/, a chroma of /4, and a range of hues from 2.5R to 7.5R when determined under fluorescent light...

New descriptors for lightness and chroma are presented that are based on properties of a wraparound Gaussian metameric to the given XYZ tristimulus coordinates. For the 1600 samples of the Munsell glossy set, both descriptors are found to correlate to Munsell value and chroma at least as well as the corresponding CIECAM02 descriptors when the Munsell samples are under the CIE C illuminant. Howe...

Many languages have no basic color term for "blue." Instead, they call short-wavelength stimuli "green" or "dark". We show that this cultural, linguistic phenomenon could result from accelerated aging of the eye because of high, chronic exposure to ultraviolet-B (UV-B) in sunlight (e.g., phototoxic lens brunescence). Reviewing 203 world languages, we found a significant relationship between UV ...

The evolution of color categorization is investigated using artificial agent population categorization games, by modeling observer types using Farnsworth-Munsell 100 Hue Test performance to capture human processing constraints on color categorization. Homogeneous populations of both normal and dichromat agents are separately examined. Both types of populations produce near-optimal categorizatio...

In this article, we present the results of analysis by two different methods for representing information in reflectance spectra of Munsell standard chips that relates to their appearance. The spectrum of a chip j is denoted as rjl where l represents wavelength k from 430 to 660 nm with 1 nm intervals. The spectrum of light reflected from a chip j under D65 is rjl 3 el where el represents the s...

We propose a new approach to retrieve images from an image MTM (Mathematical Transform to Munsell) for filtering out the non-similar images effectively. Then, we combine the color and spatial relationship of objects to measure the similarity of images. . . database. We combine both color and spatial features of a picture to index and measure the similarity of images. We propose a new automatic ...