deans community high school colour theory 2. color is the light reflected from a surface. visible...
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Deans Community High School
CDT CDT Department Department
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Colour Theory 2
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Color is the light reflected from a surface.
Visible light is made up of the wavelengths of light between infrared and ultraviolet radiation (between 400 and 700 nanometers).
Because water and dust particles in the air scatter light, objects seen at great distance lose contrast, sharpness, and brightness, and have a blue-ish tint. This effect is called Atmospheric Perspective.
What is Color?
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Additive Model RGB, Light
Color Models
Subtractitive Model CMYK, Pigment
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HueThe ‘color’ of the color. Red, Orange, Yellow, Green, Blue, Indigo, Violet
ValueLightness (tint) or darkness (shade) of a color.
Saturation (Chroma)Intensity of the hue in the color. Desaturated colors tend to look gray.
Describing Color
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HSV Color
HSV Cone
from a Mac HSV Color Picker
from a PC HSV Color Picker
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LABDesigned to be device independent.Represents the entire visible light spectrumL = LuminanceA = Green to RedB = Blue to Yellow
Other Color Models
YUVColor Model of European PAL TV standard. Developed for backwards compatibility with Black-and-White TVsY= LuminanceU = Red - YV = Blue – Y
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Color Temperature
COOL
WARM
Temperature can be measured absolutely, or relatively.
For example, yellow-green is warmer than cyan-green, but both are cool colors.
Absolute color temperatures are denoted below:
Cool colors appear more distant than warm colors due to atmospheric perspective
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Color Contrast
Contrast Of Hue
Contrast Of Value
Contrast Of Saturation
Low Contrast High Contrast
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Color Contrast For Text
Colors with strongly different hues are easy to distinguish.
But reading one on top of another can strain the eyes.
A contrast of hue is not enough to make text readable.
It needs a contrast of value or saturation, too.
Not Good!
This is better.
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Color Interaction
The colors surrounding a color affect its appearance.
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Common Color Schemes
Achromatic Monochromatic
ComplementaryAnalogous Triadic
Chromatic Grays
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Color Scheme Examples
bbc.comfox.com
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The Meaning of Color
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