It is developed by Adobe Systems using separate PostScript resources. PDF – is a cross-platform extension necessary for the visualization of printed materials in electronic form. In this case, the reduction in image quality can vary from insignificant to substantial. The file compression ratio is in the range from 10:1 to 100:1.
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The format acts simultaneously as the standard of ISO and the International Telecommunication Union. JPEG uses a "lossy" compression system and discrete cosine transform technology. Finally, the colors and brightness are coded. First, the photo is transformed into a color space YCbCr, and then it is divided into squares to determine the upper range of the color spectrum.
The procedure for compressing the digital images in JPG format is carried out in several stages. A strong contrast between several near located pixels provokes the appearance of visible artifacts. It is not recommended to use this format for compression of drawings and various kinds of graphics. The JPG algorithm is optimally suitable for compressing photographs and pictures in which realistic scenes with little contrast of colors are present. It is also frequently used in memory cards of digital video cameras. Because of the small size, it is requested by the owners of websites, allowing you to save the traffic effectively. It uses the technology of encoding smooth color renditions, providing the ability to frequently reduce the amount of data during the image's recording. JPG – is a popular graphic format characterized by a high image compression rate, which leads to a decrease in image quality.
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