60 Questions
Which of the following is NOT an attribute of colour measurement in food physics?
Shape
What is the better approach to define colour in food physics?
Objectively
What is the Munsell system used for in food physics?
Visual comparison
Why are the results of the Munsell system subjective?
They vary with assessors and conditions
What are colour spaces used for in food physics?
Objective colour measurement
What is the limitation of using colour measurement as a quality control mechanism in food manufacturing operations?
Subjectivity
How does a change in one attribute affect colour perception?
Perceived change in colour
Which method is used for colour determination of beer and worts?
Beer tintometer
After distillation, what is the color of whiskey?
Completely colorless
What is used for final color trimming of whiskey?
Caramel colouring
What method is used for color determination of whiskey instrumentally?
Minolta colorimeter
At what wavelength is the absorbance of a whiskey sample measured?
525 nm
What is the bandwidth requirement for the spectrometer used in whiskey color determination?
Less than 10 nm
What is used for color determination of cider?
Minolta colorimeter
What sets the parameters for color determination of cider?
Beer tintometer
Which colorimeter offers more flexibility in range of beverages than a Lovibond colorimeter?
Minolta colorimeter
Which of the following is a correct statement about the CIE Lab* color space?
All of the above
Which of the following is NOT required to see color?
A spectrophotometric curve
What is the purpose of representing a light source as a function?
To quantify and characterize the source
Which of the following is true about the human eye?
There are three types of cones, each sensitive to a different color
What is the trichromatic theory of color vision?
The theory that color perception is based on three primary colors
What is the measurement of color called that distinguishes between hue, saturation, and lightness?
Psychophysical quantification
What is the purpose of using XYZ reference stimuli in color measurement?
To transform data from red, green, and blue to X, Y, and Z coordinates
Which of the following is NOT one of the CIE approved illuminants for visual colour examinations?
Illuminant D
What is the purpose of the CIE 100 standard observation curves?
To quantify the average response of the human eye to red, green, and blue
Which of the following methods is NOT used for assigning colors to their appropriate locations in a color space?
Psychophysical quantification methods
What are the three elements of visual observation that can now be modeled?
Light sources, reflectance/transmission curves, and observers
Which color scale is based on the opponent colors theory and uses a three-dimensional rectangular color space?
Hunter Lab color scale
What is the formula for calculating the tristimulus color values X, Y, and Z for any sample?
X = 41, Y = 41, Z = 41
Which instrument uses a grating to break the reflected light into a spectrum and measures the amount of light at each wavelength?
Spectrophotometer
Which attribute of colour measurement is related to the shape and distribution of light, gloss, and haze?
Geometric
What is the purpose of defining colour as objectively as possible in food physics?
To interpret output in terms of how the human eye sees colour
What is the purpose of the Munsell system in food physics?
To provide a visual comparison of colours
What are colour spaces used for in food physics?
To provide a standardized color measurement
What is the limitation of using colour measurement as a quality control mechanism in food manufacturing operations?
Variation with assessors and conditions
What method is used for color determination of whiskey instrumentally?
Spectrometer
Which color scale is based on the opponent colors theory and uses a three-dimensional rectangular color space?
CIE Lab* color space
Which organization adapted the beer tintometer for color determination of beer and worts?
American Society of Brewing Chemists (ASBC)
What is the final color trimming achieved by the use of in whiskey color determination?
Caramel coloring
What instrument is used for color determination of cider?
Minolta colorimeter
What is the wavelength at which the absorbance of a whiskey sample is measured?
525 nm
What is the color of whiskey after distillation?
Completely colorless
Which colorimeter offers more flexibility in range of beverages than a Lovibond colorimeter?
Minolta colorimeter
What is the purpose of the Minolta colorimeter in cider color determination?
To measure tristimulus reading
What is the bandwidth requirement for the spectrometer used in whiskey color determination?
Less than 10 nm
What method is used for color determination of beer and worts?
Beer tintometer
What is the purpose of the CIE (Commission Internationale d’Eclairage) x, y, z standard observer curves?
To determine the human eye's response to color
What is the purpose of representing a light source as a function?
To quantify and characterize the spectral characteristics of different light sources
What is the purpose of using XYZ reference stimuli in color measurement?
To measure the amount of reflected or transmitted light at each wavelength
What is the measurement of color called that distinguishes between hue, saturation, and lightness?
CIE Lab*
Which of the following is NOT one of the CIE approved illuminants for visual color examinations?
F2
What is the better approach to define color in food physics?
Using the CIE Lab* color space
What is the trichromatic theory of color vision?
The theory that color is determined by the response of three different cones sensitive to different bands of light
Which of the following is NOT one of the CIE approved illuminants for visual colour examinations?
Illuminant D
What is the purpose of the CIE 100 standard observation curves?
To represent the average response of the human eye to red, green, and blue
Which of the following methods is NOT used for assigning colors to their appropriate locations in a color space?
Color matching curves
Which of the following is a correct statement about the CIE Lab* color space?
L represents lightness or darkness, +a is redness, -a is greenness, +b is yellowness, and -b is blueness
What are the three elements of visual observation that can now be modeled?
Illuminants, reflectance/transmittance curves, and observer curves
How does a change in one attribute affect color perception?
A change in all attributes affects color perception
Which color scale is based on the opponent colors theory and uses a three-dimensional rectangular color space?
Hunter Lab color scale
Test your knowledge of the CIE approved illuminants and their color temperatures in this quiz. Learn about the importance of standardizing the source of light for accurate visual color examinations.
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