15 Color Perception

Question 1

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

Answer 1

off/active, off/active, on/inactive

Question 2

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.

Answer 2

fluorescent light, sunlight

Question 3

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

Answer 3

fluorescent

Question 4

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

Answer 4

black, white

Question 5

Subtracting yellow and blue makes green (T/F)

Answer 5

True

Question 6

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

Answer 6

True

Question 7

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

Answer 7

white, cyan

Question 8

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

Answer 8

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.

Question 9

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)

Answer 9

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.

Question 10

Adding red and green produces:

1) Yellow
2) Reddish-green
3) Magenta
4) Black

Answer 10

1) Yellow

Question 11

Background colors influence color perception due to _____.

Answer 11

color-opposing ganglion cells

Question 12

What are the 3 components of color perception?

Answer 12

Hue, Saturation or Chroma, and Lightness/Brightness

Question 13

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

Answer 13

subtractive, additive

Question 14

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

Answer 14

mean, variance, area under the curve,

Question 15

The Munsell color system is (additive or subtractive)?

Answer 15

subtractive

Question 16

The CIE color system is (additive or subtractive)?

Answer 16

additive

Question 17

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

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

Answer 17

Munsell = Hue, Saturation, Lightness/Brightness

CIE = primary colors 1, 2 and 3

Question 18

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

Answer 18

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

Question 19

The point at which all 3 axes (x, y, and z) of the CIE color system converge contain ____.

1) white light…………….2) no light
3) sun light……………4) the secrets of the universe

Answer 19

2) no light

Question 20

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 ___.

Answer 20

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

Question 21

Complementary colors make ____.

Answer 21

white

Question 22

Match the following:

1) blue…………………… a) M and L cone
2) green…………………b) S-cone
3) yellow…………………c) M-cone

Answer 22

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

Question 23

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

Answer 23

Metamer

Question 24

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

Answer 24

subtractive color mixing, additive color mixing

Question 25

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

Answer 25

True

Question 26

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

Answer 26

True

Question 27

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

Answer 27

low, intermediate, and high

Question 28

Each type of cone has _____ peak sensitivity

Answer 28

one

Question 29

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

Answer 29

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

Question 30

An example of a monochromatic light is a _____.

Answer 30

laser

Question 31

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

Answer 31

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