xls转换jpeg
在线计算网 · 收录于 2022-08-08 12:17:29
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文件扩展名.xls
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文件类别documents
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程序Microsoft OfficeLibreOfficeKingsoft OfficeGoogle Docs
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主程序Microsoft Office
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说明XLS - 是由流行的Microsoft Excel应用程序创建的电子表格。包括位于具有特定地址的单元格中的文档数据。它们可以包含公式，与其他单元格中的信息相关联的数学方程式以及固定信息。它通常用于开发图形和图表。该格式允许存储和编辑各种参数 - 图像，表格，宏，字体，图表等。到Excel 2007版本出版为止，广泛使用，然后被替换为XMLSS扩展。XLS文档中的信息包含在一系列静态大小的流中，它们的位置使用多个段分发表来描述。它具有向后兼容性，并支持为DOS创建的各种文件格式。 Web浏览器经常使用它来排除二进制格式的使用。该实用程序包含在Microsoft Office套件中，除了Excel之外，还可以通过各种应用程序打开，如Apache Open Office，Libre Office，适用于Mac OS，Windows或Linux。
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技术细节格式的相关性通过其简单性来解释，尽管它不支持单独的功能，例如，存储VBA宏。 在XMLSS出现之前，Excel应用程序在格式化时使用了基于IFF容器格式创建的Biff扩展。 因此，可以更改书籍模板及其内容。 在2007年引入新格式后，该程序没有丢失向后兼容的属性，这保证了XLS在未来的广泛分布。 随后，XLS扩展被XLSM，XLSB和XLSX格式取代。
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MIME类型application/vnd.ms-excel
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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
