# DIT506  DESKTOP PHOTOGRAPHYVIDEO EDITING.

UNIVERSITY EXAMINATIONS: 2017/2018
EXAMINATION FOR THE DIPLOMA IN INFORMATION
TECHNOLOGY
DIT506 DESKTOP PHOTOGRAPHY&VIDEO EDITING
FULLTIME/PARTTIME
DATE: APRIL 2018 TIME: 1 ½ HOURS
INSTRUCTIONS: Answer any THREE questions.

QUESTION ONE
a) Define desktop photography (1 Mark)
b) Differentiate between photo editing and audio editing (2 Marks)
c) What are the five main advantages of digital cameras? (5 Marks)
d) Explain the process of digitizing sound (6 Marks)
e) Distinguish between lossy and lossless compression and give an example of each
(6 Marks)
QUESTION TWO
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 challenges in film photography (5 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) Using Lempel ziv coding technique encode: ABBBCCCDAADAEAABA (6 Marks)
b) Using run length coding, encode the following binary data
00000000000000100000000001000000011000000
(6 Marks)
C) Using Huffman encoding algorithm for a data file that has the following characters

i) give the Huffman tree and code (6 Marks)
ii) using (i) encode AFADBDC (2 Marks)
QUESTION FIVE
The procurement department at KCA UNIVERSITY has requested you to tender for
videography and video editing 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)

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