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jpeg转换djvu

在线计算网 · 收录于 2022-08-08 11:41:04

jpeg怎么转换成djvu

jpeg格式介绍

  • 文件扩展名.jpeg
  • 文件类别images
  • 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.
  • MIME类型image/jpeg

djvu格式介绍

  • 文件扩展名.djvu
  • 文件类别books
  • 程序LizardTech Browser Plug InMacDjView Desktop ViewerWinDjView
  • 主程序DjVuLibre DjView
  • 说明DjVu的最初是由AT&T创建和使用压缩图像的功能技术,并具有免费和可用的源代码,并将其代理为PDF。它可以扫描文档,照片和互联网上的高清晰度图像的分布。有针对它存在于Windows和Mac设备的二进制代码执行的一整套DJVU观众,浏览器插件和设备。
  • 技术细节在20世纪90年代早期和2000年后,AT&T开发DJVU由亚·莱卡,利昂·博图,帕特里克·哈夫纳和保罗·G·霍华德。它被认为是比较优越的PDF由于它能够很容易地转换大量文本DJVU的,其小大小的文件,人们可以用它DJVU的freely.the分离分为三种类型的图像,即背景,前景和掩模图像的分辨率更高。压缩algorithmIW44用于压缩前景和背景图像,而在JB2压缩掩模图像使用。这导致显著减少图像的。
  • MIME类型image/vnd.djvuimage/x-djvuapplication/octet-stream

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