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. The extension does not encode data associated with the software or OS used to develop and view it. Any file contains a description of a 2D or 3D document with all the necessary components (scan-line, vector graphics, text, and more). PDF supports color models CMYK, RGB, shades of gray, and also it has its technical formats for performing the exchange of finished documents. They are supported by Adobe Reader and many browsers, providing the plugin is installed. Files of this format do not have restrictions on the length, several types, and image options, as they allow you to embed various multimedia tools, scan-line, and vector images. PDF documents can exist separately from the OS or hardware tools with which they were developed. 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.

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