BAC1107  DIGITAL PHOTOGRAPHY AND VIDEO EDITING.

UNIVERSITY EXAMINATIONS: 2018/2019
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
APPLIED COMPUTING
BAC1107 DIGITAL PHOTOGRAPHY AND VIDEO EDITING
FULL TIME/PART TIME
DATE: APRIL, 2019 TIME: 2 HOURS
INSTRUCTIONS: Answer Question One & ANY OTHER TWO questions.

QUESTION ONE –COMPULSORY (30 MARKS)
a) i) Define PHOTO editing ( 2 Marks)
ii) What are the challenges of linear video editing? (4 Marks)
b) What are the two main advantages of the video effects in video production?
(4 Marks)
c) An audio file occupies 11680KB. If its recorded at (96khz, 16 bit and stereo). What is
the duration in minutes (4 Marks)
d) Explain what is meant by
i) The frequency (2 Marks)
ii) The amplitude (2 Marks)
e) What do the following acronyms mean.
i) NTSC
ii) DVB
iii) ISDB
iii) USB (4 Marks)
f) Distinguish between titles and credits (4 Marks)
g) State the Nyquist sampling theorem (2 Marks)
h) Distinguish between protocols and standards? (2 Marks)
QUESTION TWO
a) A video file of a size 6000 GB , colour depth of 24 bits, duration of 3 hours, and frame
rate of 30fps, takes 3 hours to download using a bandwidth of 100MBps.
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 500 users are to download the same video for 2hrs
concurrently (2 Marks)
iv) cost of the bandwidth in a) if the cost of 128KBps is Kshs 5,000 (4 Marks)
b) Recommend a suitable method to enable your target audience to view the video
(4 Marks)
QUESTION THREE
a) Define a pixel (1 Mark)
b) Camera has a resolution of 9560×6890. If the size of the graphical images created is
125MB.
Calculate
i) Pixel count (2 Marks)
ii) Colour depth (2 Marks)
iii) Number of colours that can be displayed (2 Marks)
iv) Aspect ratio (2 Marks)
c) If the storage space is 32GB for the camera in b) and that it can take 250 pictures,
what is the compression ratio for the algorithm used (2 Marks)
d) State Four advantages of using MP3 format over MIDI format in audio editing
(4 Marks)
e) State FIVE features found in digital cameras that challenge the film cameras
(5 Marks)
QUESTION FOUR
a) State the challenges that are experienced in undersea photography (6 Marks)
b) Using run length coding, encode the following binary data
1000000000000010000000001000000000110000000001
(6 Marks)
C) Using Huffman encoding algorithm for a data file that has the following characters
Character A B C D E
Frequency 20 16 12 14 20
i) Draw the Huffman tree and code (6 Marks)
ii) encode ABEDCA (2 Marks)
QUESTION FIVE
a) State FIVE considerations in producing a professional advert? (5 Marks)
b) State four factors that are essential in video capturing (5 Marks)
c) What is the size of uncompressed stereo sound with CD quality for 25 minute of audio :
(4 Marks)
d) Using LZ coding encode the following text
ABBCCBBBBAMAMBAABBMA (6 Marks)

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