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 (B)</p> Signup and view all the answers

What are colour spaces used for in food physics?

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

How does a change in one attribute affect colour perception?

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

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

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

After distillation, what is the color of whiskey?

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

What is used for final color trimming of whiskey?

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

What method is used for color determination of whiskey instrumentally?

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

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

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

What is used for color determination of cider?

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

What sets the parameters for color determination of cider?

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

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

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

Which of the following is NOT required to see color?

<p>A spectrophotometric curve (D)</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 (D)</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 (C)</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 (A)</p> Signup and view all the answers

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

<p>Psychophysical quantification (B)</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 (D)</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 (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 (A)</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 (C)</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 (B)</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 (A)</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 (C)</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 (B)</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 (C)</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 (D)</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 (D)</p> Signup and view all the answers

What are colour spaces used for in food physics?

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

What method is used for color determination of whiskey instrumentally?

<p>Spectrometer (B)</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 (A)</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) (B)</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 (A)</p> Signup and view all the answers

What instrument is used for color determination of cider?

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

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

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

What is the color of whiskey after distillation?

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

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

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

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

<p>To measure tristimulus reading (D)</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 (C)</p> Signup and view all the answers

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

<p>Beer tintometer (C)</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 (B)</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 (A)</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 (B)</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* (A)</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 (C)</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 (C)</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 (A)</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 (C)</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 (D)</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 (D)</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 (C), L represents lightness or darkness, +a is redness, -a is greenness, +b is yellowness, and -b is blueness (D)</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 (D)</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 (A)</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 (B)</p> Signup and view all the answers

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