Digital Image Processing Questions And Answers – Color Fundamentals

This set of Digital Image Processing test focuses on “Color Fundamentals”.

1. How many categories does the color image processing is basically divided into?
a) 4
b) 2
c) 3
d) 5
View Answer

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

2. 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
View Answer

Answer: a
Explanation: 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 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.

3. What are the basic quantities that are used to describe the quality of a chromatic light source?
a) Radiance, brightness and wavelength
b) Brightness and luminence
c) Radiance, brightness and luminence
d) Luminence and radiance
View Answer

Answer: c
Explanation: Three quantities are used to describe the quality of a chromatic light source: radiance, luminance and brightness.
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4. What is the quantity that is used to measure the total amount of energy flowing from the light source?
a) Brightness
b) Intensity
c) Luminence
d) Radiance
View Answer

Answer: d
Explanation: 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 flows from the light source and is generally measured in watts (W).

5. 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
View Answer

Answer: a
Explanation: 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 dominant wavelength in a mixture of light waves. Saturation refers to the relative purity or the amount of white light mixed with a hue.
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6. 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
View Answer

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

7. 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)
View Answer

Answer: a
Explanation: 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. A colors the specified by its trichromatic coefficients x, y & z: =X/(X+Y+Z), y=Y/(X+Y+Z), z=Z/(X+Y+Z).
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8. 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
View Answer

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

9. What is the value obtained by the sum of the three trichromatic coefficients?
a) 0
b)-1
c) 1
d) Null
View Answer

Answer: c
Explanation: From the equations: x=X/(X+Y+Z), y=Y/(X+Y+Z), z=Z/(X+Y+Z) it is the noted that sum of the coefficients is x+y+z≅1.
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10. What is the name of 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
View Answer

Answer: a
Explanation: The triangle in C.I.E chromatic diagram shows a typical range of colors called the color gamut produced by RGB monitors. The irregular region inside the triangle is representative of the color gamut of today’s high-quality color printing devices.

Sanfoundry Global Education & Learning Series – Digital Image Processing.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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