InfoPanel

【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