COMPUTER NETWORKING

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MULTIMEDIA AND QUALITY OF SERVICE

COMPRESSION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
File compression can be lossy or lossless. Lossy compression works by removing or simplifying some of the detail from image or sound data so that the file becomes smaller. How does a lossless compression reduce file size?
A
It removes and throws away some of the information.
B
It converts repeating values into an encoded form that takes less space.
C
It relies upon a link to the internet.
D
None of the above
Explanation: 

Detailed explanation-1: -With lossless compression, every bit of data originally in a file remains after it is uncompressed, and all the information is restored. Lossy compression reduces a file by permanently eliminating certain information, especially redundant information.

Detailed explanation-2: -Lossless compression retains values and manages to lower file size. However, lossy compression reduces file size by eliminating redundant information. While LZ77 is an example of lossless compression, JPEG is an example of lossy compression.

Detailed explanation-3: -Lossy image compression is a process that removes some of the data from your image file, reducing the overall file size. This process is irreversible, meaning that the file information will be removed permanently.

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