Food Colour

15 important questions on Food Colour

What are the general functions of color?

  • Gastronomic function
    • Appetizing/social function
  • Indicator Function
    • Ripeness(green tomato), freshness, etc
  • On-pack communication function
    • Health claim, etc.

What are dependent variables that have effect on total appearance? (interrelation ship

  • Lightning of the scene
    • color rendering: color change under different light
    • Direction and distribution
  • Material/object (food properties)
    • Optical ( gloss)
    • Physical ( shape, roughness, texture
  • Viewer depend variables

What are the three food properties?

  • Transparent
  • Shiny
  • Opaque
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What is the difference between Transparent and Translucent ?

  • Translucent:  some light will go through (milk)
  • Opaque: No light will go through 

What is meaning Adelson checker illusion?

That vision can be fooled, our brain takes the shadow into account.

What are examples of viewer dependent variables?

  • Receptor mechanisms
    • colour vision, ageing effects, other sense
  • Inherited and learned responses
    • culture, fashion, memory etc.
  • Immediate environment
    • Geographical, social, medial

What effect of colour on consumer?

  • Do not like atypical colours
  • Colours have a function
  • Effect of package colour

What do we see ( subjective measurement) ?

  • Hue(tint): the basic colour of light; red compared to yellow
  • Value: the lightness of the colour;  amount of gray in a colour
  • Chroma/saturation:  the purity or strength of the colour.

What are functions of the trichromatic and monochromatic brightness detecting system?

  • Trichromatic: colour sensing system
  • Monochromatic:  brightness detecting system

What is detention of objective measurement?

Classification of the colour in universal quantities which describe the colour independently of the product an the observer

What are measuring tools for subjective vs objective measurements?

Subjective: Colour cards, with the eye
Objective: Instrumental measuring
    • Spectrophotometer
    • Tristimulus color mete3rs

What is Munseel colour sytem?

  • Based on visual colour impression
  • 3 attribues in a 3-demnional space
    • hue
    • chroma/saturation
    • value (lightness)

CIE L*a*b* colour system?

  • L*: from whit to dark
  • +a*: Red to green -a*
  • +b: yellow to blue -b*

What are applications of measuring colour in food?

  • Different processing methods and the effect on the colour
  • Computer vision for quality control

What is computer vision in quality control ?

  • Appearance of the food is important for food choice, colour is important quality indicator
  • Automatic extraction and anlaysis of information
  • rapid, consistent, objective
    • Crates of apples

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