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Digital compression of a file of a photo with losses and lost-free |
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| Digital compression of a file of a photo with losses and lost-free |
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| Digital photos are kept as digital files on electronic mass-media. Digital photos consist from pikselov everyone with unique colour and intensity. While digital photos should not be compressed in most cases, they. Compression serves, one purpose do files smaller and save the warehouse areas. |
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Digital photos are kept as digital files on electronic mass-media. Digital photos consist from pikselov everyone with unique colour and intensity. While digital photos should not be compressed in most cases, they. Compression serves, one purpose do files smaller and save the warehouse areas.
Digital photo - constructed from pikselov. Piksel - a unique point in a photo which has a value. Value pixel’s represents the colour and intensity. Usually everyone piksel is presented by value RGB (Red, Green and Dark blue which has united, together create colour pixel’s) which occupies 3 bytes. Digital files of a photo can be very big. For example, if you shoot at a photo, using 8 mega pikselov the digital chamber at a photo will be 8000000 pikselov each employment of 3 bytes. The full size of a file would be 8000000*3=24000000 or 24 mbytes. However and the following the compressed use of correct technology, this file could be much more smaller - approximately 3 mbytes, it will be extended.
There are two main types of technologies of compression: with losses and lost-free:
Compression lost-free:
Compression lost-free means, that if you take a file, compress it and then develop it – the developed file would be an exact copy of an original file. With compression lost-free no data are lost in – compression process, the compression software uses the best data presentation in a file, but it does not delete data from this.
Compression with losses:
Compression with losses means, that if you take a file, to compress it and then to develop it is the developed file would be a little various than original. The software of compression not only represents file’s data more effectively, but also it also deletes data which it has analysed as being insignificant or not the important. Such data can be removed without hardly any significant degradation in the compressed quality of a file. Distinctions between an original file and the developed file are insignificant and insignificant to the user.
Compression lost-free is usually applied to the text and other data where all data are equally important. For example compressing the text in this article and later developing it you would like to receive exact original article without any words or the offers lowered by the software of compression which has decided, that they were not important.
Compression with losses on the other hand is usually applied to digital photos and graphic files. Such files are included by data which the spectator would not be to notice in a condition if is removed. For example small changes paint photos could not to be remarkable. The developed file not precisely same as original, but considering both original and developed photos nearby, the spectator cannot tell distinction. The software of compression with losses can be established in the various levels of compression based on those, how many data allow to be lost. During some moment loss of too big data is remarkable and worsens digital quality of a photo. Many digital chambers allow you to establish level of compression from low to high where high compression means smaller files, but it is less than quality, and low compression means the big files, but any significant qualitative degradation.
Digital photos are almost exclusively compressed, using technologies with losses. The reason - that because of the photo nature (it includes noise, very much minor alterations which are difficult for compressing, but are not important for representation and more) technologies of compression lost-free, do not act well on it. On the other hand technologies of compression With losses can be very effective in reduction digital – the sizes of a file of a photo sometimes an order of size or more. |
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| About the Author |
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This article can be published, only if a resource box, including backlink is included. You can find more information concerning the digital press of a photo and a photo in general on http://www.printrates.com - a site devoted to digital printing editions
Article source: http://www. ArticlesTake.com/author-ziv-h.-694.html |
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