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King Fahd University of Petroleum and Minerals
College of Computer Science and Engineering
Information and Computer Science Department
SWE 423-01: Multimedia Systems
Fall 2007-2008
Quiz#2, Saturday October 20th, 2007
Name: Sample Solution
ID#:
1.
(7 points) With regard to "out of gamut" color:
a. (2 point) What do we mean by an "out of gamut" color?
A color in which the corresponding display device cannot display (i.e. its
out of its range of displayable colors).
b. (2 point) When does it happen?
When the value of R, G, or B corresponding to the color that needs to
be displayed is negative.
c. (3 points) How is it dealt with?
By approximating it with the color on the intersection of the in-gamut
color boundaries and the line connecting the out-of-gamut color and the
white point.
2. (7 points) With respect to additive color mixing and subtractive color mixing:
a. (4 points) When are additive color mixing and subtractive color mixing
used?
Additive color mixing is used in display devices and subtractive color
mixing is used in printing devices, both to produce a wide range of
colors.
b. (3 points) In the CMY model, an additional black channel, K, is used.
Briefly explain the reason.
Since black is generated by mixing the three "primary" colors for
printing, Cyan, Magenta, and Yellow, it is much more cost effective to
provide black color on a separate channel, especially with large volumes
of black/gray-scale printing environments.
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3. (6 points) Choose the most appropriate answer for the following questions. Answer
the next 3 questions with respect to the following diagram
A
B
a. The part pointed to by A is part of the outer ear and is called
i. Eardrum
iii. Hammer
iv. Auditory nerve
ii. Ear Canal
b.
i. The outer ear contains three bones: hammer, anvil and stirrup.
ii. The middle ear contains three bones: hammer, anvil and stirrup.
iii. The inner ear three contains bones: hammer, anvil and stirrup.
iv. None of the above statements is true.
c. The part pointed to by B is actually part of the outer ear and is called:
iii. Basilar membrane
i. Eardrum
ii. Anvil
iv. Pinna
d. The following component, which is part of the outer ear, converts the
acoustic energy (sound) into mechanical energy (vibrations):
iii. Basilar membrane
i. Eardrum
ii. Anvil
iv. Pinna
e. The following component, which is part of the inner ear, detects the
amplitude and frequency of sound:
i. Eardrum
iii. Basilar membrane
ii. Anvil
iv. Pinna
f. High compression ratios for efficient storage of audio signals can be
achieved because
i. The ear is highly sensitive to small defects in desirable signals
ii. The ear ignores large defects in signals it assumes are irrelevant
iii. Both i and ii
iv. None of the above