By Dr.Swathi Pai
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Tuesday, December 9, 2008
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Hue: the name of the color (red, blue, green, etc.)
Hue order: violet, blue, green, yellow, orange, red (380-760nm)
Value: the whiteness or blackness of a color
- a low value is closer to black and a high value is closer to white
Chroma: the saturation or intensity of the hue
Munsell color system: recognized the basic color ordering system---a 3-D sphere of hue, value, & chroma
The 10 hue in order: red, yellow-red, yellow, green-yellow, green, blue-green, blue, purple-blue, purple, red-purple
The additive color system:
- the primary colors of this system: red, green, & blue
- mixing of the 3 primary colors in this system gives white
- the secondary colors of this system: magenta or violet (red + blue)
- yellow (red + green)
- cyan (blue + green)
- Complimentary colors: the addition of a primary and secondary color gives white
The subtractive color system:
- the primary colors of this system: cyan, magenta, & yellow
- mixing of the 3 subtractive colors in this system gives black
- the secondary colors of this system: red, green, & blue
The partitive color system (aspects of both the primary and secondary systems)
- here, insert orange to replace cyan
- the primary colors in this system are red, green, blue, & yellow
- The complimentary colors of the modified subtractive color system wheel:
- red----green
- orange----blue
- yellow----violet
- transparent: allows the transmission of all light
- translucent: allows transmission of light, but one cannot see through the object
- spectral reflectance: reflection without diffusion (surface reflection of light without diffusion.
- Metamerism: a phenomenon that occurs when 2 objects match in color under certain lighting conditions, but do not match under others. This occurs when objects have different spectral curves
- rods of retina: responsible for interpreting brightness differences. Used for vision at low light levels.
- cones of retina: mediators of color vision
- the act of squinting reduces the light on the retina, activates the rods and discriminates value differences
- the easiest modification with color: raising the chroma (add yellow, brown, or red)
- yellow = vita B, brown = vita A, and red = vita D
- Hue shift: to move yellow toward orange, add pink
- Adding yellow decreases redness of an orange hue
- A more difficult modification: reducing the chroma---utilize this with the complimentary color: ex: yellow---add violet orange---add blue
- To reduce the value, add the complimentary color or brown
- A very difficult procedure: raising the value---yellow is the only color that will change the hue, increase chroma, & raise the value.
- To create apparent translucency, blue is the key hue
Category:
Prosthodontics Notes
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