15 Color Perception Flashcards Preview

Vision Science I > 15 Color Perception > Flashcards

Flashcards in 15 Color Perception Deck (32)
Loading flashcards...
1
Q

When a person sees a black object: The L-cone ____ is ____, the M-cone ____ is ____, the S-cone _____ is ____

A

off/active, off/active, on/inactive

2
Q

Fluorescent light and sunlight both appear white, however, _____ has peaks of different wavelengths at different energy levels and _____ has constant energy levels across the visible spectrum.

A

fluorescent light, sunlight

3
Q

A patient can be sensitive to ____ light because of the varied energy/wavelength peaks.

A

fluorescent

4
Q

The 3 colors used in subtractive mixing combine to create ____. The 3 colors used in additive mixing combine to create _____.

A

black, white

5
Q

Subtracting yellow and blue makes green (T/F)

A

True

6
Q

Subtracting pure (narrow wavelength) yellow and blue makes black (T/F)

A

True

7
Q

If you add green, blue and red you get ____. If you add green and blue with out the red, you get ____.

A

white, cyan

8
Q

An example of additive color mixing is ____. An example of subtractive color mixing is ____.

A

Additive= Red, green, and blue pixels in your computer screen in the form of light. Subtractive= Cyan, magenta, and yellow as the primary ink colors in an ink cartridge.

9
Q

Adding (red, green, and blue) produces (cyan, magenta, and yellow) as secondary colors and subtracting (cyan, magenta, and yellow) produce (red, green, and blue) secondary colors (T/F)

A

TRUE (A secondary color is the result of mixing 2 primary colors) for example green plus blue makes cyan, and magenta minus yellow produces red.

10
Q

Adding red and green produces:1) Yellow 2) Reddish-green3) Magenta4) Black

A

1) Yellow

11
Q

Background colors influence color perception due to _____.

A

color-opposing ganglion cells

12
Q

What are the 3 components of color perception?

A

Hue, Saturation or Chroma, and Lightness/Brightness

13
Q

Lightness is a product of _____ color mixing. Brightness is a product of _____ color mixing.

A

subtractive, additive

14
Q

On a graph of #photons/wavelenth: Hue is the ____, Saturation/Chroma is the ____, Lightness/Brightness is the ____.

A

mean, variance, area under the curve,

15
Q

The Munsell color system is (additive or subtractive)?

A

subtractive

16
Q

The CIE color system is (additive or subtractive)?

A

additive

17
Q

In the Munsell color sytem ____, ____, and ____ represent the 3 axes. In the CIE color system ____, ____, and ____ represent 3 axes.

A

Munsell = Hue, Saturation, Lightness/BrightnessCIE = primary colors 1, 2 and 3

18
Q

To portray the 3-dimensional image of the CIE color system as 2-dimensional graph, the values of all 3 axes must add up to ____. A) 1……..B) 2……..C) 3……..D) 22.5

A

A) 1 (x + y + z = 1)

19
Q

The point at which all 3 axes (x, y, and z) of the CIE color system converge contain ____.1) white light…………….2) no light3) sun light……………4) the secrets of the universe

A

2) no light

20
Q

According to the CIE color space, the point for blue green has the following values: y=0.29 and x=0.03, therefore z must equal ___.

A

z = 0.68 (x + y + Z = 1)

21
Q

Complementary colors make ____.

A

white

22
Q

Match the following:1) blue…………………… a) M and L cone2) green…………………b) S-cone3) yellow…………………c) M-cone

A

(1-b) (2-c) (3-a)

23
Q

All colors can be produced from 2 primary colors? (T/F)

A

False (all colors can be produced by 3 primary colors)

24
Q

_____ is a pair of lights or surfaces that look the same but have a different spectra.

A

Metamer

25
Q

Color with crayons is an example of _____, whereas, color with light is an example of _____.

A

subtractive color mixing, additive color mixing

26
Q

Sunglasses are an example of a band pass filter (T/F)

A

True

27
Q

Trichromatic theory is based on relative activation of cones (T/F)

A

True

28
Q

The gas in a fluorescent light produces what 3 types of spectrum light?

A

low, intermediate, and high

29
Q

Each type of cone has _____ peak sensitivity

A

one

30
Q

The peak sensitivity for an S-cone is ____, for an M-cone is _____, and for an L-cone is _____

A

S = 420nm, M = 530nm, L = 562nm

31
Q

An example of a monochromatic light is a _____.

A

laser

32
Q

White light, such as natural sunlight or fluorescent light, activates which cones?

A

All 3 cones (S, M, and L) must be activated to see white light