principles of color science Flashcards
what is “gloss”?
the amount of light reflected at the surface of a material
although instruments are available to measure _____, most instruments do not precisely cover the entire range of possible _____ values
gloss
what must be taken into account when performing a visual inspection for gloss?
- know the shape of the illuminant
- assess the quantity of the reflected light
- assess the quality of the reflected light
what are the 3 components that effect color?
1) illumination
2) object
3) observer
what is meant by “opaque”
light cannot pass through the material
what is meant by translucent? transparent?
translucent- light (and therefore color) pass through the material, but is partially absorbed./scattered
transparent- light and color pass through the material unaltered
what is the wavelength range of visible light?
380-780 nm
what are the 3 dimensions of color described by Munsell?
Lightness (value)
chroma
hue
_____ is the term munsell gave to “color purity”
chroma
a color value of ____ would be black, while a color value of ___ would be white
black= 0
white= 10
for tooth colors, the limit of perceptibility is ____ CIELAB units
2
in dentistry, a CIELAB color difference of less than ____ may be considered acceptable
3.5
what does a rendering index do?
describes how the colors of objects under the illuminant differ from the colors of the same object under standard daylight
for a rendering index, the closer the value is to ____, the more the colors of the object look like they do under daylight
100
what is metamerism
2 objects: they appear to have the same color under some illuminant, but different color under differing illuminant
