week 8 Flashcards
What do rods do
Don’t help us see colour
Help us see in the dark
What are the three colours of wavelength cones
Red green and blue
Difference between red green and blue wave length cones
Long wavelength cones are red
Medium wavelength cones are green
Short wavelength cones are blue
What are the two types of colour systems
Additive and subtractive
What is the additive colour system
Uses light
The more you add the lighter the colour becomes
Eventually you get white light
What is the subtractive colour system
Uses ink or paint
The more you add the darker it becomes
Eventually you get black
What are three colour descriptors
hue, saturation, brightness
What is hue
Based on pure colours
Pure versus impure colour
Pure colour or colours of the visible light spectrum
Impure colours are colours washed out by various other wavelengths of light
What is saturation
Strength of the purity of a colour
The more saturated a colour the more _______ the colours appear
rich and deep
What is saturation also called
Chroma
What is brightness
How light or dark a colour appears
What is brightness also referred to as
Value or lightness
What are three other colour models we may encounter
LAB
HSL
RGB
What does LAB stand for
L = luminance with black at zero and white at 100
A = Red/green axis
B - Yellow/blue axis
What does the graph for the LAB model look like
A grey pole with a colour wheel in the middle
What does the HSL colour model stand for
H is Hue
S is saturation
L is lightness
What does the HSL colour model look like
Like the SLC
Hue is curved line
Saturation is horizontal line
Lightness is vertical line going up
What is the RGB colour model look like
A cube with colours
Red is the top
Green is bottom left
Blue is bottom right
What are six factors that influence how we see colour
- Light environment
- Surface reflectance
- Colour temperature
- Surrounding colours
- Colour juxtaposition
- Colour constancy
What is light environment
We need a minimum amount of light to see colour properly
the purkinje effect
What is the purkinje effect
The light sensitivity of a human I shift towards blue as the environment gets darker
In terms of light environment what happens when there’s too much light
Too much light makes colours bloom
and makes them white
