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THIS IS A SCREENCAST THAT SHOWS YOU HOW TO MAKE A LOSSLESS COMPRESSION.

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Nikon NEF Raw File Compression Quality Tests

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THIS IS A SCREENCAST THAT SHOWS YOU HOW TO

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Here we can see how lossless compression works, as we already explained, the information can me fully restored.

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With lossless compression, every single bit of data that was originally in the file remains after the file is uncompressed. All of the information is completely restored. This is generally the technique of choice for text or spreadsheet files, where losing words or financial data could pose a problem.

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https://scholar.google.com.ar/scholar?q=lossless+and+lossy+compression&hl=es&as_sdt=0&as_vis=1&oi=scholart&sa=X&ved=0CBkQgQMwAGoVChMIxuamy7ypyAIVgn4aCh2BNglS

This link contains a lot of college articles about this issue. Hope you like it and can find

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Lossy compression reduces a file by eliminating certain information, especially redundant information. Due to this the data content is different from the original and it loose quality. However it is still likely enough to be used. It is generally used to compress multimedia files (audio, images, videos), where a certain amount of information loss will not be detected by most of the users.

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This is a page that is usefull to calculate the Data Compression Ratio

http://www.csgnetwork.com/datacompressioncalc.html

What is the compression ratio?

It is used to quantify the reduction in data-representation size produced by a data compression algorithm. The data compression ratio is analogous to the physical compression ratioused to measure physical compression of substances.

What happens if you try to compress the same file more than one time?

For lossless compression, the only way you can know how many times you can gain by recompressing a file is by trying. It depends on the file and te algorithm.

Two files can never compress to the same output, so you can't go down to one byte.

The reason that the second compression sometimes works is that a compression algorithm can't do omniscient perfect compression. Your file is being changed from all data to a combination of data about your data and the data itself.

http://stackoverflow.com/questions/1166385/how-many-times-can-a-file-be-compressed

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Lossy and Lossless are two types of data compression. These processes are used to reduce data size for storage, handling, and transmitting content. To put it in other words, it simply reduce the number of bits that are needed to do any of the things recently named. This can be done with any document in the case of lossless compression, or any multimedia file in the case of lossy compression. These two techniques work in different ways.

The main differences:

1. Lossless compression reduce the number of bits without loosing any information.

2. Lossy compression reduce data by loosing irrelevant information and as a result the file loose quality.

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This is the way lossy compression acts when using imagesDifferent versions of the photo of the flamingo at the bottom, from the left to the right, show how higher degrees of approximation create coarser images as more details are removed.