COMPUTER SCIENCE AND ENGINEERING
SYSTEM SOFTWARE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Usually performed on text
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When some original data is lost and the original file cannot be re-created
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Turning the text into a format that only a reader with a key can decrypt it
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The original file can be re-created from the compressed file
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Detailed explanation-1: -In lossy compression, the data in a file is removed and not restored to its original form after decompression. Specifically, data is permanently removed, which is why this method is also known as irreversible compression. This data loss is not usually noticeable.
Detailed explanation-2: -Lossy compression algorithms reduce the size of files by discarding the less important information in a file, which can significantly reduce file size but also affect file quality.
Detailed explanation-3: -Both lossy and lossless compression techniques will result in some information being lost from the original file. Neither lossy nor lossless compression can actually reduce the number of bits needed to represent a file. Lossless compression is only used in situations where lossy compression techniques can’t be used.
Detailed explanation-4: -Joint Photographic Expert Group (JPEG) files are compressed using lossy compression, which may result in the loss of relevant information. Generally, JPEG files are 8-bit color images, so any JPEG originating from a device with a higher bit depth will already be compressed by a reduction in dynamic range and bit depth.