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1、单击此处编辑主标题单击此处编辑副标题单击此处编辑标题正文部分样例A正文部分样例B正文部分样例C正文部分样例D正文部分样例I正文部分样例II正文部分样例III单击此处编辑标题正文部分样例A正文部分样例B正文部分样例C正文部分样例D正文部分样例I正文部分样例II正文部分样例III正文标题第一级第二级 第三级第四级第五级正文标题第一级第二级 第三级第四级第五级样例文本AGemmiC 超人气PPT模板尽在如下豆单欢迎大家欣赏和下载样例文本AGemmiC 超人气PPT模板尽在如下豆单欢迎大家欣赏和下载样例文本B虽然任何对JPEG图像的处理都有可能导致因为解压后再压缩而引起的损耗，然而，对于简单的旋转动作
2、，数学上是可以有办法使图像得以旋转而无损图像本身的数据。也就是说，有一种方法可以在无需把图像解压后才可以旋转。这是因为JPEG的文件格式本身是以一个个模块为单位来压缩，所以，只需要把模块重排，再对每个模块旋转，就可以达至无损耗的旋转。目前只有少数绘图软件支持无损耗旋转，但需要用户在操作上加以注意。例如：在Adobe Photoshop里，用户若要作无损耗旋转前，必须在加载图像之后立刻用“Save As.”功能存储一个备份。然后当图像旋转过后，由于Photoshop已掌握了图像的基本数据，所以在存储时得以使用原来的设置。若没有作事先存储，Photoshop就会把旋转后的图像重新计算各项参数，并重
3、新对图像进行压缩处理。这样就会造成数据的损耗。样例文本B虽然任何对JPEG图像的处理都有可能导致因为解压后再压缩而引起的损耗，然而，对于简单的旋转动作，数学上是可以有办法使图像得以旋转而无损图像本身的数据。也就是说，有一种方法可以在无需把图像解压后才可以旋转。这是因为JPEG的文件格式本身是以一个个模块为单位来压缩，所以，只需要把模块重排，再对每个模块旋转，就可以达至无损耗的旋转。目前只有少数绘图软件支持无损耗旋转，但需要用户在操作上加以注意。例如：在Adobe Photoshop里，用户若要作无损耗旋转前，必须在加载图像之后立刻用“Save As.”功能存储一个备份。然后当图像旋转过后，由于
4、Photoshop已掌握了图像的基本数据，所以在存储时得以使用原来的设置。若没有作事先存储，Photoshop就会把旋转后的图像重新计算各项参数，并重新对图像进行压缩处理。这样就会造成数据的损耗。样例文本CCompuServe introduced the GIF format in 1987 to provide a color image format for their file downloading areas, replacing their earlier run-length encoding (RLE) format, which was black and white on
5、ly. GIF became popular because it used LZW data compression, which was more efficient than the run-length encoding that formats such as PCX and MacPaint used, and fairly large images could therefore be downloaded in a reasonably short time, even with very slow modems.The original version of the GIF
6、format was called 87a. In 1989, CompuServe devised an enhanced version, called 89a,1 which added support for animation delays (multiple images in a stream were already supported in 87a), transparent background colors, and storage of application-specific metadata. The 89a specification also supports
7、incorporating text labels as text (not embedding them in the graphical data), but as there is little control over display fonts, this feature is not widely used. The two versions can be distinguished by looking at the first six bytes of the file (the magic number or signature), which, when interpret
8、ed as ASCII, read GIF87a and GIF89a, respectively.样例文本CCompuServe introduced the GIF format in 1987 to provide a color image format for their file downloading areas, replacing their earlier run-length encoding (RLE) format, which was black and white only. GIF became popular because it used LZW data
9、compression, which was more efficient than the run-length encoding that formats such as PCX and MacPaint used, and fairly large images could therefore be downloaded in a reasonably short time, even with very slow modems.The original version of the GIF format was called 87a. In 1989, CompuServe devis
10、ed an enhanced version, called 89a,1 which added support for animation delays (multiple images in a stream were already supported in 87a), transparent background colors, and storage of application-specific metadata. The 89a specification also supports incorporating text labels as text (not embedding
11、 them in the graphical data), but as there is little control over display fonts, this feature is not widely used. The two versions can be distinguished by looking at the first six bytes of the file (the magic number or signature), which, when interpreted as ASCII, read GIF87a and GIF89a, respectivel
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