BAC 1107 DIGITAL PHOTOGRAPHY AND VIDEO EDITING.

UNIVERSITY EXAMINATIONS: 2017/2018
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
APPLIED COMPUTING
BAC 1107: DIGITAL PHOTOGRAPHY AND VIDEO EDITING
FULL TIME/PART TIME
DATE: DECEMBER, 2017 TIME: 2 HOURS
INSTRUCTIONS: Answer Question One & ANY OTHER TWO questions.

QUESTION ONE –COMPULSORY (30 MARKS)
a) i) Define photography (2 Marks)
ii) What is photography, a science and an art? Explain? (4 Marks)
b) What are the two main advantages of the sound track in video production? (4 Marks)
c) An audio file occupies 254 MB. If its recorded at (44.1khz, 16 bit and stereo). What is the
duration in minutes (4 Marks)
d) Most of the time sound is represented graphically as a wave. Explain what is meant by
i) The amplitude of the sound
ii) The frequency of the sound (4 Marks)
e) What do the following acronyms mean.
i) PAL
ii) NTSC
iii) SECAM
iv) HDTV (4 Marks)
f) State the nyquist sampling theorem (2 Marks)
g) Why some applications need to use MIDI? (2 Marks)
h) Distinguish between storyboarding and timelining (4 Marks)
QUESTION TWO
The procurement department at KCA UNIVERSITY has requested you to tender for videography and
videoediting services for the upcoming university graduation and prepare a documentary to be aired on
national television. Prepare an elaborate report indicating the equipment you have and the estimated costs
for the services. Marks will be given for a comprehensive workflow of the required activities and
references indicating your qualification and experiences in such functions.
(20 Marks)
QUESTION THREE
a) A video file of a size 19770.56 GB , colour depth of 20 bits, duration of 3 hours, and frame rate
of 30fps, takes 5 hours to download using a bandwidth of 1.1GBps.
Calculate
i) the pixel count of the camera in megapixels (8 Marks)
ii) the resolution, if the aspect ratio is 16:9 (2 Marks)
iii) the bandwidth requirements, if 20 users are to download the same video for 5hrs
concurrently (2 Marks)
iv) cost of the bandwidth in a) if the cost of 128KBps is Kshs 60,000 (4 Marks)
b) Recommend a suitable method to enable your target audience to view the video (4 Marks)
QUESTION FOUR
a) Define a pixel (2 Marks)
b) Camera has a resolution of 5120×4850. If the size of the graphical images created is
53.28MB.
Calculate
i) Pixel count (2 Marks)
ii) Colour depth (3 Marks)
iii) Number of colours that can be displayed (2 Marks)
iv) Aspect ratio (2 Marks)
c) If the storage space is 8GB for the camera in b) and that it can take 307 pictures, what is the
compression ratio for the algorithm used (2 Marks)
d) State Four advantages of using JPEG format over BMP format in photo editing
(4 Marks)
e) State Three features found in digital cameras that edged out the traditional cameras
(3 Marks)
QUESTION FIVE
a) Using Lempel ziv coding technique encode: ABBBCCCDAADAEAABA (6 Marks)
b) Using runlength coding, encode the following binary data
00000000000000100000000001000000011000000
(6 Marks)
C) Using Huffman encoding algorithm for a data file that has the following characters
Character A B C D
Frequency 10 16 19 7
i)give the Huffman tree and code (6 Marks)
ii) encode ABBADC (2 Marks)

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