It is the process of encoding information, using fewer bits than the original representation.
What is a data compression ratio ?
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Why is data compression an important technique for the online world ?
It helps reduce the comsuption of expensive resources eg. hard disc space or bandwidth
What is the difference between Lossy and Lossless data compession ?
Lossy compression compresses data, making them into smaller files, keeping the high quality picture. But this type of compression throws away data, which cannot be restored, hence the name. While the Lossless data compression only allows an approximation of the original data to be reconstructed, in exchange for better compression rates. Some Lossless data compression include, ZIP format files.
Which methods offers the greatest compression ratio ?
Lossy
Why is human psychology and perception an important factor in methods of Lossy compression ?
As the user, you need to know what you are doing, as when you use Lossy compression, you cannot go back. Once your data is compressed you cannot retrieve the data that is loss. So making the right decision for what type of compression is essential.
Name Lossy file formats for audio, still image and video format ?
Audio - MP3
Still Image - JPEG
Video - AVI
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