It is used to connect a picture with an OS file. The first is the image mask, and the second is the icon displayed on the front. ICO – is a special format for displaying icons, shortcuts, icons in Windows OS. 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. 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. Then it is divided into squares to determine the upper range of the color spectrum. First, the photo is transformed into a color space YCbCr. The procedure for compressing the digital images in JPEG format is carried out in several stages. It is not recommended to use this format to compress drawings and various graphics since a big difference between several near located pixels provokes visible artifacts.
The JPEG 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 reduce the amount of data frequently during the image recording. JPEG – is a popular graphic file format, which is characterized by a high degree of compression, which leads to a decrease in image quality.
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