OPERATING SYSTEMS FOR COMPUTERS
COMPUTER OPERATING SYSTEMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Compression
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Program
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Backing Up
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Tree Structure
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Restoring
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Detailed explanation-1: -Compression techniques fall into two classes: lossless and lossy. Both are very common in use: an example of lossless compression is ZIP archive files and an example of lossy compression is JPEG image files.
Detailed explanation-2: -Examples of lossless compression include GZIP, Brotli, WebP, and PNG, Lossy compression, on the other hand, uses inexact approximations by discarding some data from the original file, making it an irreversible compression method.
Detailed explanation-3: -Data compression is a reduction in the number of bits needed to represent data. Compressing data can save storage capacity, speed up file transfer and decrease costs for storage hardware and network bandwidth.
Detailed explanation-4: -The JPEG compression is a block based compression. The data reduction is done by the subsampling of the color information, the quantization of the DCT-coefficients and the Huffman-Coding (reorder and coding). The user can control the amount of image quality loss due to the data reduction by setting (or chose presets).