jpeg转换3gp
在线计算网 · 收录于 2022-08-08 11:41:04
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文件扩展名.jpeg
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文件类别images
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程序Adobe PhotoshopApple PreviewCorel Paint Shop Pro
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主程序MS Paint
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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.
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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.
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MIME类型image/jpeg
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文件扩展名.3gp
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文件类别video
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程序QuickTime PlayerVLC Media PlayerWindows Media Player
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主程序Adobe Flash Professional
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说明该3GP是为在1998年它的功能第一次作为一个多媒体支持下开发的。它是由第三代合作伙伴项目开发。这种支持通常用于基于GSM（全球移动通信系统）手机。由于它采用的是低带宽和需要的文件更小的空间，它使用较少的数据，它是适合手机。
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技术细节该3GP格式是基于MPEG-14的结构。该3GP，以使其成为手机更好的空间和带宽的需求下降。这是很容易使用，因为它用于存储，共享和编辑文件提供了灵活性。视频部分被保存为MPEG-4第2部分，H.263等音频部分保存为AMR-WB，AMR-WB +，AMR-NB等。 PlayStation 3的可以编码的音频文件与外部USB驱动器共享。虽然任天堂DSi有助于使用3GP文件到SD卡。
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MIME类型video/3gppaudio/3gpp
