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(SPRING 2014) ASSIGNMENT
DRIVE WINETR SPRING 2014
PROGRAM BSc IT
SUBJECT CODE & NAME BT0077, Multimedia Systems
SEMESTER Third
BK ID B1004
CREDITS 2
MARKS 30
1 Define digital multimedia and explain digital multimedia challenges.
Answer : Digital media are any media that are encoded in a machine-readable format.Digital media
can be created, viewed, distributed, modified and preserved on computers. Computer programs and
software; digital video; web pages and websites, including social media; data and databases; digital
audio, such as mp3s; and e-books are examples of digital media. Digital media are frequently
contrasted with print media,
2. Explain the following color models
1. HSB model
Answer : Based on the human perception of color, the HSB model describes three fundamental
characteristics of color:
 Hue is the color reflected from or transmitted through an object. It is measured as a location
on the standard color wheel, expressed as a degree between 0 and 360. In common use, hue
is identified by the name of the color such as red, orange, or green.
 Saturation, sometimes called chroma, is the strength or purity of the color. Saturation
represents the amount of gray in proportion to the hue, measured as a percentage from 0
(gray) to 100 (fully saturated). On the standard color wheel, saturation increases from the
center to the edge.
 Brightness is the relative lightness or darkness of the color, usually measured as a
percentage from 0 (black) to 100 (white).
Although you can use the HSB model in Photoshop Elements to define a color in the Color Picker
dialog box, there is no HSB mode available for creating and editing images.

2. 2. RGB model
Answer : RGB and its subset CMY form the most basic and well-known color model. This model bears
closest resemblance to how we perceive color. It also corresponds to the principles of additive and
subtractive colors.
3. CMYK model
Answer : Cyan, magenta, and yellow correspond roughly to the primary colors in art production: red,
blue, and yellow. In the illustration below, you can see the CMY counterpart to the RGB model
shown above:
4. L*a*b model
Answer : The L*a*b color model is based on the model proposed by the Commission Internationale
d'Eclairage (CIE) in 1931 as an international standard for color measurement. In 1976, this model
was refined and named CIE L*a*b.
3. Describe the GIF and JPEG file formats with their features.
Answer : GIF file format -
An acronym for Graphics Interchange Format, created originally in 1987 by CompuServe to facilitate
the exchange of images between different platforms. The file format is known for its compression
and the fact that it can store and display multiple images. The major drawback to GIF is that images
can only use up to 256 distinct colors
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