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AU14 Fixed Restorative III > Principles of Color Science > Flashcards

Principles of Color Science Flashcards

1
Q

What three things affect the interaction of illumination between the object and the human visual system

A

gloss
translucency
color

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2
Q

This is the amount of light reflected at the surface of a material, with consideration also of the dispersion or scattering of the reflected light from the specular angle of reflection

A

gloss

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3
Q

True or False
Although instruments are available to measure gloss, most instruments do not precisely cover the entire range of possible gloss value

A

True

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4
Q

Visual assessment of gloss is recommended for clinical evaluation via knowing these three things

A

know the shape of the illuminant
assess the quantity of reflected light
assess the quality of reflected light

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5
Q

What are the three components of color

A

illuminant
object
observer (receives and interprets)

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6
Q

This quality is when light cannot pass through the material, the material masks any underlying color

A

opaque

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7
Q

This quality is when light, and therefore color pass through the material but it partly absorbed, scattered, or both

A

translucent

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8
Q

This quality is when light and color pass through the material unaltered

A

transparent

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9
Q

The illuminant, the object, and the light entering the eye are each this

A

spectral, comprising energy at every visible wavelength

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10
Q

What is the visible light spectrum

A

380nm-780nm above UV and below infrared

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11
Q

What is CIE lightness (L*) or Munsell Value

A

taking a color, red for example, and making it lighter (more white) or darker

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12
Q

Although light entering the eye is spectral, the 3 different types of cones in the eye simplify this spectrum unto what

A

3 aspects or the 3 dimensions of color; value, chroma, hue

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13
Q

What are the two dimensions os chromaticity

A

chroma and hue

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14
Q

What are the variations in Munsell hue

A

differences like between red - blue - yellow - green - purple - blue/green - red/purple - etc.

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15
Q

What are the variations in Munsell chroma

A

increasing the intensity of the color, like red, red → more red → super red, etc.

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16
Q

What is the perceptibility threshold

A

“scientifically there is a color difference, but cannot physically see it”

17
Q

What is the value of color difference when comparing two colors

A

ΔE is approximately one is perceivable, if the difference between two colors is ≥1, then differences are noted

18
Q

For tooth colors, what is the limit of perceptibility

A

2 CIELAB units

19
Q

In dentistry, a CIELAB color difference of less than what may generally be considered as acceptable

A

~3.5

20
Q

What are the specifications of illuminants involving color temperature

A

if you heat things up, the color can change from red → yellow → white → blue

21
Q

What is the color of the temperature 1,800K

A

red-orange

22
Q

What is the color of the temperature 3,000K

A

yellow

23
Q

What is the color of the temperature 5,555K

A

white; balanced white light

24
Q

What is the color of the temperature 25,000K

A

bluish white

25
Q

This describes how the colors of objects under the illuminant differ from the colors of the same objects under a standard (daylight) illuminant

A

rendering index

26
Q

The closer to this value, the more the colors of objects look like they do under daylight

A

100

27
Q

The rendering index varies from what

A

0-100

28
Q

What is metamerism

A

When you have two objects
no (or negligible) color difference under some illuminant
color difference under other illuminant

29
Q

What happens to the light scattering with a translucent layer on opaque backing

A

only a portion gets let out, the rest gets reflected internally

30
Q

As the light comes in to a translucent layer on opaque backing it can be what

A

absorbed (energy transfer) or scattered (change in direction over and over)

31
Q

What is the ratio of absorption/scattering with low lightness ( aka dark)

A

high

32
Q

What is the ratio of absorption/scattering with high lightness (aka bright)

A

low

33
Q

Scattering causes a change in what of the light

A

direction

34
Q

Absorption causes a lowering of the what of light

A

intensity

35
Q

Chromatic pigments have absorption which is highly dependent on what

A

wavelength

36
Q

What is the absorption and/or scattering when the translucent is low (aka opaque)

A

high

37
Q

What is the absorption and/or scattering when the translucency is high

A

both are low

AU14 Fixed Restorative III (10 decks)

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