# Color Models MCQ [Free PDF] – Objective Question Answer for Color Models Quiz

1. Color model is also named as (another name):

a) Color space
b) Color gap
c) Color space & color system
d) Color system

A color model is also called a color space or color system. Its purpose is to facilitate the specification of colors in some standard, generally accepted way.

2. What do you mean by the term pixel depth?

a) It is the number of bits used to represent each pixel in RGB space
b) It is the number of bytes used to represent each pixel in RGB space
c) It is the number of units used to represent each pixel in RGB space
d) It is the number of mm used to represent each pixel in RGB space

Images represented in the RGB color model consist of three component images one for each primary color. When fed into an RGB monitor, these three images combine on the phosphor screen to produce a composite color image. The number of bits used to represent each pixel in RGB space is called the pixel depth.

3. How many bits of RGB color images are represented by a full-color image?

a) 32-bit RGB color image
b) 24-bit RGB color image
c) 16-bit RGB color image
d) 8-bit RGB color image

The term full-color image is used often to denote a 24-bit RGB color image. The total number of colors in a 24-bit RGB color image is (28)3=16777216.

4. What is the equation used to obtain S component of each RGB pixel in RGB color format?

a) S=1+3/(R+G+B) [min⁡(R,G,B)].
b) S=1+3/(R+G+B) [max⁡(R,G,B)].
c) S=1-3/(R+G+B) [max⁡(R,G,B)].
d) S=1-3/(R+G+B) [min⁡(R,G,B)].

If an image is given in RGB format then the saturation component is obtained by the equation.

S=1-3/(R+G+B) [min⁡(R,G,B)].

5. What is the equation used to obtain the I(Intensity) component of each RGB pixel in RGB color format?

a) I=1/2(R+G+B)
b) I=1/3(R+G+B)
c) I=1/3(R-G-B)
d) I=1/3(R-G+B)

If an image is given in RGB format then the intensity (I) component is obtained by the equation, I=1/3 (R+G+B).

6. What is the equation used for obtaining R value in terms of HSI components?

a) R=I[1-(S cos⁡H)/cos⁡(60°-H) ].
b) R=I[1+(S cos⁡H)/cos(120°-H)].
c) R=I[1+(S cos⁡H)/cos⁡(60°-H) ].
d) R=I[1+(S cos⁡H)/cos(30°-H) ].

Given values of HSI in the interval [0, 1], the R-value in the RGB components is given by the equation:

R=I[1+(S cos⁡H)/cos⁡(60°-H) ].

7. What is the equation used for calculating the B value in terms of HSI components?

a) B=I(1+S)
b) B=S(1-I)
c) B=S(1+I)
d) B=I(1-S)

Given values of HSI in the interval [0, 1], the B value in the RGB components is given by the equation: B=I(1-S).

8. What is the equation used for calculating the G value in terms of HSI components?

a) G=3I-(R+B)
b) G=3I+(R+B)
c) G=3I-(R-B)
d) G=2I-(R+B)

Given values of HSI in the interval [0, 1], the B value in the RGB components is given by the equation: G=3I-(R+B).

9. Which of the following color models are used for color printing?

a) RGB
b) CMY
c) CMYK
d) CMY and CMYK

The hardware-oriented models which are prominently used in the color printing process are CMY (cyan, magenta, and yellow) and CMYK (cyan, magenta, yellow and black).

10. How many categories does the color image processing divided into?
a) 4
b) 2
c) 3
d) 5

Color image processing is divided into two major areas: full-color and pseudo-color processing.

11. What are the names of categories of color image processing?

a) Full-color and pseudo-color processing
b) Half-color and full-color processing
c) Half-color and pseudo-color processing
d) Pseudo-color and Multi-color processing

Color image processing is divided into two major areas: full-color and pseudo-color processing. In the first category, the images are acquired with a full-color sensor like a color TV or color scanner. In the second category, there is a problem of assigning a color to a particular monochrome intensity or range of intensities.

12. What are the basic quantities that are used to describe the quality of an achromatic light source?

b) Brightness and luminance

Three quantities are used to describe the quality of a chromatic light source: radiance, luminance, and brightness.

13. What is the quantity that is used to measure the total amount of energy flowing from the light source?

a) Brightness
b) Intensity
c) Luminance

Three quantities are used to describe the quality of a chromatic light source: radiance, luminance, and brightness. Radiance is used to measure the total amount of energy that flows from the light source and is generally measured in watts (W).

14. What are the characteristics that are used to distinguish one color from the other?

a) Brightness, Hue, and Saturation
b) Hue, Brightness, and Intensity
c) Saturation, Hue
d) Brightness, Saturation, and Intensity

The characteristics generally used to distinguish one color from another are brightness, hue, and saturation. Brightness embodies the chromatic notion of intensity. Hue is an attribute associated with a dominant wavelength in a mixture of light waves. Saturation refers to the relative purity or the amount of white light mixed with a hue.

15. What are the characteristics that are taken together in chromaticity?

a) Saturation and Brightness
b) Hue and Saturation
c) Hue and Brightness
d) Saturation, Hue, and Brightness

Hue and saturation are taken together are called chromaticity and therefore, a color may be characterized by its brightness and chromaticity.

16. Which of the following represent the correct equations for trichromatic coefficients?

a) x=X/(X+Y+Z), y=Y/(X+Y+Z), z=Z/(X+Y+Z)
b) x=(Y+Z)/(X+Y+Z), y=(X+Z)/(X+Y+Z), z=(X+Y)/(X+Y+Z)
c) x=X/(X-Y+Z), y=Y/(X-Y+Z), z=Z/(X-Y+Z)
d) x=(-X)/(X+Y+Z), y=(-Y)/(X+Y+Z), z=(-Z)/(X+Y+Z)

Tri-stimulus values are the amounts of red, green, and blue needed to form any particular color and they are denoted as X, Y, and Z respectively.

Colors the specified by its trichromatic coefficients x, y & z: =X/(X+Y+Z), y=Y/(X+Y+Z), z=Z/(X+Y+Z).

17. What do you mean by tri-stimulus values?

a) It is the amount of red, green, and yellow needed to form any particular color
b) It is the amount of red, green, and indigo needed to form any particular color
c) It is the amount of red, yellow and blue needed to form any particular color
d) It is the amount of red, green, and blue needed to form any particular color

The amounts of red, green, and blue needed to form any particular color are called the tristimulus values and are denoted by X, Y, and Z respectively. Color is then specified by its trichromatic coefficients, whose equations are formed from tri-stimulus values.

18. What is the value obtained by the sum of the three trichromatic coefficients?

a) 0
b)-1
c) 1
d) Null

From the equations: x=X/(X+Y+Z), y=Y/(X+Y+Z), and z=Z/(X+Y+Z) it is then noted that some of the coefficients are x+y+z≅1.

19. What is the name of an area of the triangle in C. I E chromatic diagram that shows a typical range of colors produced by RGB monitors?

a) Color gamut
b) Tricolor
c) Color game
d) Chromatic colors