png转换jpeg
在线计算网 · 收录于 2022-08-08 11:53:02
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文件扩展名.png
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文件类别images
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程序Apple PreviewMicrosoft Windows PhotosAdobe Photoshop CCCorel Paint Shop ProMicrosoft Windows Photo Gallery Viewer
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主程序Microsoft Paint
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说明PNG 是一种光栅图形格式，是作为 GIF 的替代品开发的，它基于前一代产品的最佳功能，包括无损压缩和透明背景支持。PNG技术确保保留所有的编辑阶段和恢复步骤，同时保持质量。但是，它不允许一次将多张图片保存在一个文件中，这限制了它在动画图像开发中的使用。
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技术细节PNG 扩展名被提出来作为一种工具，有助于在万维网上传输和存储图像。该技术仅限于8位透明通道，因此，可以调颜色透明度（自不透明的到透明的）。它支持24位真彩色图像（RGB彩色图像）以及灰度级图像。但是，作为一种非专业的格式，PNG无法显示其他彩色空间。PNG格式文件可用许多程序打开，也可用自带的图片浏览器打开。PNG图像特点是所占空间小且质量好。
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MIME类型image/png
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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
