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.
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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. 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. 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. Compression rates of 10:1 or 20:1 yield little degradation in image quality.JPEG – is a popular graphic file format, which is characterized by a high degree of compression, which leads to a decrease in image quality. Compression rates of 100:1 can be achieved, although the loss is noticeable at that level. JPEG involves a lossy compression mechanism using discrete cosine transform (DCT). JPEG is a joint standard of the International Telecommunications Union (ITU-T T.81) and the International Organization for Standardization (ISO 10918-1). JPG is a graphical file format for editing still images, it offers a symmetrical compression technique which is processor intensive and time consiming in both compression and decompression. The JPG file is a great format as it often manages to compress files to 1/10 of the size of the original file which is especially good for saving on bandwidth. The JPG format is often used in digital camera memory cards. The resultant 'lossy' file means that quality can never be recovered. JPG's are often used for web sites and email as they are generally smaller file sizes as they are lossy meaning that some image quality is lost when the JPG is compressed and saved.
They do not encode information that is specific to the application software, hardware, or operating system used to create or view the document. A PDF file can be any length, contain any number of fonts and images and is designed to enable the creation and transfer of printer-ready output.Įach PDF file encapsulates a complete description of a 2D document (and, with the advent of Acrobat 3D, embedded 3D documents) that includes the text, fonts, images and 2D vector graphics that compose the document.
PDF is a file format developed by Adobe Systems for representing documents in a manner that is separate from the original operating system, application or hardware from where it was originally created.
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