今天有人问我，怎么在一些博客上留言，能显示留言用户的图像？看来还有有些朋友不知道Gravatar。在这里做一下简单的介绍。
Gravatar(Globally Recognized Avatar的缩写)意为“全球通用头像”。如果在Gravatar的服务器上放置了你自己的头像，那么在任何支持Gravatar的blog或者留言本上留言时，只要提供你与这个头像关联的email地址，就能够显示出你的Gravatar头像来。
很多独立博客支持Gravatar，WordPress已经能直接支持Gravatar。其它博客系统也都有对应的插件，只要博主支持Gravatar，那么你留言时的Email地址就会与图片地址绑定。
1、首先是到Gravatar网站上去注册一个账号，很简单，只要填写一个你最常用的email，接着输入两次密码，送出之后，系统会寄一封确认信到你的信箱，开信，点一下启用账号连结即可。
2、接着，到Gravatar去登入，登入后，就可以开始上传你的图片了。上传的尺寸的长和宽的范围在80-512像素之间即可。Gravatar会提供自动裁剪工具。格式支持JPG／GIF／PNG，推荐使用JPG和PNG格式（Gravatar已经支持透明PNG图片）。另外，
Gravatar也支持摄像头拍照功能，这项功能由来自中国的工程师设计、开发。图片上传完成后，等待着网站的管理员对头像图片分级(G 普通级、PG 辅导级、R 和 X 为限制级)。
3、等待审核，如果在工作时间一般半小时就能审核通过。审核的原因是避免图片太黄太暴力。
通过之后这个头像就可以使用了。在任何支持Gravatar的地方，在填写email地址时，请填写你申请注册头像用的这个email地址。你的头像就会出现在留言中。
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