【InfoPanel】
The Info panel shows the color values beneath the pointer and, depending on the tool in use, gives other useful information.
Choose Window > Info.
You can change the information displayed by clicking the triangle in the upper right corner of the panel and choosing Panel Options from the panel menu.
参考：http://helpx.adobe.com/photoshop/using/image-information.html#work_with_the_info_panel
原文：http://www.cnblogs.com/tekkaman/p/4121673.html