jpeg转换jpg
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.jpg
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文件类别images
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程序Microsoft Windows Photo Gallery ViewerAdobe PhotoshopAdobe SuiteApple PreviewCorel Paint Shop ProMost web browsers
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说明JPG -是最常用的图像文件格式，特点是高度压缩，导致压缩后的图像质量明显降低。使用颜色平滑过渡的编码技术, 使在记录原始的图像数据时，极大减少数据量。
由于JPG的文件格式很小 因此合适发布于网页中，可以节省网站流量。同样.JPG图像格式也常用于数码相机的存储卡中。 JPG算法最适合于压缩含颜色很少、具有大块颜色相近的区域或亮度差异十分明显的较简单的图片。不建议使用JPG格式压缩绘图和各种图纸中的图形，因为许多定位像素之间的对比度差值很强烈，会出现明显的伪像 (不自然痕迹)。
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技术细节JPG格式的数字图像的压缩过程可分为几个阶段。
首先，影像转换为一种称为YCbCr的不同色彩空间，然后将其分成正方形以确定颜色光谱的上限范围。最后将颜色和亮度分别进行编码。
JPEG专家组开发了两种基本的压缩算法，一种是有损压缩系统，另一种是采用离散余弦变换技术(Discrete Cosine Transform，DCT)。该格式同时作为ISO和国际电信联盟的标准。文件压缩比在10：1到100：1的范围内。在这种情况下，图像质量的降低可以从轻微变化到实质变化。
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MIME类型image/jpeg
