# Digital Image Processing Questions And Answers – Color Models

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This set of Digital Image Processing Multiple Choice Questions & Answers (MCQs) focuses on “Color Models”.

1. Color model is also named as (another name):
a) Color space
b) Color gap
c) Color space & color system
d) Color system

Explanation: A color model is also called as 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

Explanation: Images are represented in the RGB color model consist of three component images one for each primary color. When fed into 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 bit RGB color image is represented by 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

Explanation: 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.
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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)].

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

5. What is the equation used to obtain 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)

Explanation: 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) ].

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

7. What is the equation used for calculating 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)

Explanation: 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 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)

Explanation: 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

Explanation: 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).

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