技术细节此文件被创建与包含在为Office Open XML的ECMA-376标准其规格是唯一的。 PPTX文件可以通过压缩和解一个目录中创建，但是，该目录的内容必须是相同的，与具有以XML格式的内容子文件夹的OPC结构。任何应用程序是使用XML可以在新文件格式的使用数据相兼容。此外，PPTX文件类似于DOCX文件格式，因为它提高了数据恢复，数据和文件管理。
程序Adobe PhotoshopApple PreviewCorel Paint Shop Pro
主程序MS Paint
说明JPEG – is a popular graphic format, which is characterized by a high degree of compression, which leads to a decrease in image quality. It uses the technology of encoding of smooth color renditions, providing the ability to reduce the amount of data frequently during the recording of the image.
Because of the small size it is requested by the owners of websites, allowing you to save the traffic effectively. It is also frequently used in memory cards of digital video cameras. The JPEG algorithm is optimally suitable for compressing photographs and pictures, in which realistic scenes with little contrast of colors are present. It is not recommended to use this format for compression of drawings and various kinds of graphics, since a strong contrast between a number of closely located pixels provokes the appearance of visible artifacts.
技术细节The procedure for compressing the digital images in JPEG format is carried out in several stages. First, the photo is transformed into a color space YCbCr, then it is divided into squares to determine the upper range of the color spectrum. Finally, the colors and brightness are coded.
JPEG uses a "lossy" compression system and discrete cosine transform technology. The format acts simultaneously as the standard of ISO and the International Telecommunication Union. The file compression ratio is in the range from 10:1 to 100:1. In this case, the reduction in image quality can vary from insignificant to substantial.
