jpeg转换mpeg
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.mpeg
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文件类别video
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程序Windows Movie MakerVLC Video PlayerApple iTunesQuicktime Player
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主程序Windows Media Player
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说明在MPEG，媒体格式今天的焦里更兼容，因为它是在1993年首次生产，已被广泛用于音频和视频的存储。该格式是相当先进的，不仅要减少文件大小的能力，但它也可以更方便地上传和下载压缩它们。出于这个原因，它已经不仅用于生产视频CD和数字电视的是传送声音。 MPEG是由Windows和Mac的支持。
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技术细节所述MPEG-1格式是针对视频的编码创建并存储的大约1.5 Mbit / s的，它允许CD或低质量DVD的编码相关联的音频。 MPEG-2是专为高品质的电视。在MPEG-3格式，它已在HDTV中创建一个更高的分辨率，然后用MPEG-2格式，因为非常相似的组合。的MPEG-4格式用于由计算机使用的图形内容，而压缩和编码是更有效的。
