CIE Approved Illuminants
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Questions and Answers

Which of the following is NOT an attribute of colour measurement in food physics?

  • Shape (correct)
  • Saturation
  • Hue
  • Gloss

    • What is the better approach to define colour in food physics?

  • Qualitatively
  • Quantitatively
  • Subjectively
  • Objectively (correct)

    • What is the Munsell system used for in food physics?

  • Visual comparison (correct)
  • Quality control mechanism
  • Interpreting output
  • Objective colour measurement

    • Why are the results of the Munsell system subjective?

    <p>They vary with assessors and conditions</p> Signup and view all the answers

    What are colour spaces used for in food physics?

    <p>Objective colour measurement</p> Signup and view all the answers

    What is the limitation of using colour measurement as a quality control mechanism in food manufacturing operations?

    <p>Subjectivity</p> Signup and view all the answers

    How does a change in one attribute affect colour perception?

    <p>Perceived change in colour</p> Signup and view all the answers

    Which method is used for colour determination of beer and worts?

    <p>Beer tintometer</p> Signup and view all the answers

    After distillation, what is the color of whiskey?

    <p>Completely colorless</p> Signup and view all the answers

    What is used for final color trimming of whiskey?

    <p>Caramel colouring</p> Signup and view all the answers

    What method is used for color determination of whiskey instrumentally?

    <p>Minolta colorimeter</p> Signup and view all the answers

    At what wavelength is the absorbance of a whiskey sample measured?

    <p>525 nm</p> Signup and view all the answers

    What is the bandwidth requirement for the spectrometer used in whiskey color determination?

    <p>Less than 10 nm</p> Signup and view all the answers

    What is used for color determination of cider?

    <p>Minolta colorimeter</p> Signup and view all the answers

    What sets the parameters for color determination of cider?

    <p>Beer tintometer</p> Signup and view all the answers

    Which colorimeter offers more flexibility in range of beverages than a Lovibond colorimeter?

    <p>Minolta colorimeter</p> Signup and view all the answers

    Which of the following is a correct statement about the CIE Lab* color space?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is NOT required to see color?

    <p>A spectrophotometric curve</p> Signup and view all the answers

    What is the purpose of representing a light source as a function?

    <p>To quantify and characterize the source</p> Signup and view all the answers

    Which of the following is true about the human eye?

    <p>There are three types of cones, each sensitive to a different color</p> Signup and view all the answers

    What is the trichromatic theory of color vision?

    <p>The theory that color perception is based on three primary colors</p> Signup and view all the answers

    What is the measurement of color called that distinguishes between hue, saturation, and lightness?

    <p>Psychophysical quantification</p> Signup and view all the answers

    What is the purpose of using XYZ reference stimuli in color measurement?

    <p>To transform data from red, green, and blue to X, Y, and Z coordinates</p> Signup and view all the answers

    Which of the following is NOT one of the CIE approved illuminants for visual colour examinations?

    <p>Illuminant D</p> Signup and view all the answers

    What is the purpose of the CIE 100 standard observation curves?

    <p>To quantify the average response of the human eye to red, green, and blue</p> Signup and view all the answers

    Which of the following methods is NOT used for assigning colors to their appropriate locations in a color space?

    <p>Psychophysical quantification methods</p> Signup and view all the answers

    What are the three elements of visual observation that can now be modeled?

    <p>Light sources, reflectance/transmission curves, and observers</p> Signup and view all the answers

    Which color scale is based on the opponent colors theory and uses a three-dimensional rectangular color space?

    <p>Hunter Lab color scale</p> Signup and view all the answers

    What is the formula for calculating the tristimulus color values X, Y, and Z for any sample?

    <p>X = 41, Y = 41, Z = 41</p> Signup and view all the answers

    Which instrument uses a grating to break the reflected light into a spectrum and measures the amount of light at each wavelength?

    <p>Spectrophotometer</p> Signup and view all the answers

    Which attribute of colour measurement is related to the shape and distribution of light, gloss, and haze?

    <p>Geometric</p> Signup and view all the answers

    What is the purpose of defining colour as objectively as possible in food physics?

    <p>To interpret output in terms of how the human eye sees colour</p> Signup and view all the answers

    What is the purpose of the Munsell system in food physics?

    <p>To provide a visual comparison of colours</p> Signup and view all the answers

    What are colour spaces used for in food physics?

    <p>To provide a standardized color measurement</p> Signup and view all the answers

    What is the limitation of using colour measurement as a quality control mechanism in food manufacturing operations?

    <p>Variation with assessors and conditions</p> Signup and view all the answers

    What method is used for color determination of whiskey instrumentally?

    <p>Spectrometer</p> Signup and view all the answers

    Which color scale is based on the opponent colors theory and uses a three-dimensional rectangular color space?

    <p>CIE L<em>a</em>b* color space</p> Signup and view all the answers

    Which organization adapted the beer tintometer for color determination of beer and worts?

    <p>American Society of Brewing Chemists (ASBC)</p> Signup and view all the answers

    What is the final color trimming achieved by the use of in whiskey color determination?

    <p>Caramel coloring</p> Signup and view all the answers

    What instrument is used for color determination of cider?

    <p>Minolta colorimeter</p> Signup and view all the answers

    What is the wavelength at which the absorbance of a whiskey sample is measured?

    <p>525 nm</p> Signup and view all the answers

    What is the color of whiskey after distillation?

    <p>Completely colorless</p> Signup and view all the answers

    Which colorimeter offers more flexibility in range of beverages than a Lovibond colorimeter?

    <p>Minolta colorimeter</p> Signup and view all the answers

    What is the purpose of the Minolta colorimeter in cider color determination?

    <p>To measure tristimulus reading</p> Signup and view all the answers

    What is the bandwidth requirement for the spectrometer used in whiskey color determination?

    <p>Less than 10 nm</p> Signup and view all the answers

    What method is used for color determination of beer and worts?

    <p>Beer tintometer</p> Signup and view all the answers

    What is the purpose of the CIE (Commission Internationale d’Eclairage) x, y, z standard observer curves?

    <p>To determine the human eye's response to color</p> Signup and view all the answers

    What is the purpose of representing a light source as a function?

    <p>To quantify and characterize the spectral characteristics of different light sources</p> Signup and view all the answers

    What is the purpose of using XYZ reference stimuli in color measurement?

    <p>To measure the amount of reflected or transmitted light at each wavelength</p> Signup and view all the answers

    What is the measurement of color called that distinguishes between hue, saturation, and lightness?

    <p>CIE L<em>a</em>b*</p> Signup and view all the answers

    Which of the following is NOT one of the CIE approved illuminants for visual color examinations?

    <p>F2</p> Signup and view all the answers

    What is the better approach to define color in food physics?

    <p>Using the CIE L<em>a</em>b* color space</p> Signup and view all the answers

    What is the trichromatic theory of color vision?

    <p>The theory that color is determined by the response of three different cones sensitive to different bands of light</p> Signup and view all the answers

    Which of the following is NOT one of the CIE approved illuminants for visual colour examinations?

    <p>Illuminant D</p> Signup and view all the answers

    What is the purpose of the CIE 100 standard observation curves?

    <p>To represent the average response of the human eye to red, green, and blue</p> Signup and view all the answers

    Which of the following methods is NOT used for assigning colors to their appropriate locations in a color space?

    <p>Color matching curves</p> Signup and view all the answers

    Which of the following is a correct statement about the CIE Lab* color space?

    <p>L represents lightness or darkness, +a is redness, -a is greenness, +b is yellowness, and -b is blueness</p> Signup and view all the answers

    What are the three elements of visual observation that can now be modeled?

    <p>Illuminants, reflectance/transmittance curves, and observer curves</p> Signup and view all the answers

    How does a change in one attribute affect color perception?

    <p>A change in all attributes affects color perception</p> Signup and view all the answers

    Which color scale is based on the opponent colors theory and uses a three-dimensional rectangular color space?

    <p>Hunter Lab color scale</p> Signup and view all the answers

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