View Image Size Information in Photoshop
To view image information in Photoshop, users can click on "Image" on the main menu and then click "Image Size." You can also get the "Image Size" window by pressing <Ctrl><Alt><I> from the keyboard.
In this window, information including file size, dimensions (in pixels or percent), document size (in inches, centimeters, millimeters, points, picas, columns or percent), and other options such as scaling, constraint, and re-sampling.
From the "Image Size" window, users can not only inspect document properties, but they can change them to fit their requirements. If a user needs more space to work with, however, this part of the image information in Photoshop cannot do that. The size and properties of the work space can be viewed by clicking the "Canvas Size" option from the "Image" menu.