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?
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?
What are measuring tools for subjective vs objective measurements?
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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