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Color Analysis

Food Analysis Final Exam

T or F: Cones are responsible for daylight and color vision while rods are responsible for night vision. True
Name three methods for describing and specifying color. Verbal, visual matching, and instrumental.
Define hue in accordance with the Munsell system. "Color"
Define value in accordance with the Munsell system. Lightness and darkness; from zero (black) to ten (white).
Define chroma/saturation in accordance with the Munsell system. Intensity; extent to which a color differs from gray of the same value.
Describe the Munsell color system. Colors are arranged in 3D according to hue, value, and chroma, expressed as HV/C.
Illuminant ___ corresponds to overcast daylight. C
Illuminant ___ corresponds to direct sunlight. B
Illuminant ___ corresponds to average daylight. D65
Illuminant ___ corresponds to an incandescent light bulb. A
Describe the CIE Tristimulus system. X, Y, and Z (amount of red, green, and blue required respectively) are plotted X vs Y to give a color match.
Color may be determined instrumentally via _____ or ____. colorimeter, spectrophotometer
Name the three main components of a Tristimulus colorimeter. Source of illumination, filters to modify energy light distribution, and a photoelectric detector.
T or F: Colorimeters have a high degree of accuracy but not precision. False
Spectrophotometers measure the _____ or reflectance of a sample. transmittance
Describe the Hunter color system. Measures three parameters: L (lightness/darkness), a (red or green), and b (yellow or blue).
Define specular light. Light for which the angle of reflection is equal to the angle of incidence.
Smooth polished surfaces have a high degree of ____ ____. specular reflection
Rough surfaces have a high degree of ____ ____. diffuse relection
T or F: Transparent samples transmit light. True
T or F: Translucent samples only reflect light. False
What is the disadvantage to 45/0 or 0/45 geometry? Only a measure of reflectance, not transmission.
How are color tolerances determined? Subtract standard L, a, and b from that of a sample that is being measured and determine a numerical difference.
Created by: goberoi