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data portablilty -compression - Coggle Diagram
data portablilty -compression
Data compression
This is when we make a file take up less memory space while still retaining information
Faster transfer of files over the internet
There are two types of data compression:
Lossy Compression
Removes some file data such as reducing the number of colours used in an image.
Small reduction in image quality
JPEG an example of Lossy compression
Lossless Compression
Maintains the quality of the file
No data lost.
Winzip an example
Reduces file size for sending over internet. Decompressed on far side without any loss of quality
Why we do it
Allow for faster transfer of files
Necessary since everything has internet access
Save memory space
We have an increasing amount of storage but files are also getting bigger
How it can affect files
Files can lose some data – lossy
Files can become corrupted during this process – reasonably rare
Files can hide other pieces of data inside them
Viruses