key转换jpeg
在线计算网 · 收录于 2022-08-08 12:33:05
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文件扩展名.key
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文件类别documents
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程序File Viewer LiteKeynote
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主程序Apple iWork
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说明关键文件扩展名是用于主题演讲。该软件是由苹果公司为创建取得和播放演示。 Mac OS X的包是用来储存演示文稿。该文件具有所有游戏演示。它配备了像幻灯片，图片，转换信息和文本呈现的平台。此外，密钥文件可以是用于用于演示的XML数据的存储装置。它是在2003年推出与PowerPoint竞争。
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技术细节为主题的文件的规格不可用，但可以通过苹果iWork的引用'05文件格式。密钥文件是与其他文件压缩ZIP文件，以弥补.key文件。它的新版本保存文件与苹果的专利IWA文件格式，“元数据目录中的.plist文件，‘数据’目录有相似背景和幻灯片的照片，以及预览JPG文件图像资产“指标”目录。在iWork的主题文件只能通过iWork的打开。
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MIME类型application/x-iwork-keynote-sffkeyapplication/vnd.apple.keynote
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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
