Open the gradblue10.jpg document and detach the image file.

打开gradblue10 . jpg文档并分离图像文件。

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For example, if you find yourself cracking open a WAR file so that you can replace the file named index.gif with a different image (which must be named index.gif).

例如，如果您试图打开一个WAR文件，那么您可以用一个不同的图像(必须用index . gif来命名)来替换用index . gif命名的文件，您是进行定制而不是扩展。

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Then close the original GIF file because we are done with it, and then open the image with the new format you have just saved.

接着关闭GIF文件打开你刚存储的图片。

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When authorised users open the file, they see the watermark, which tells them that the image has not been manipulated or corrupted in some irreversible way.

ECONOMIST: MONITOR