Frequent question - what is the difference between two different layers like "Image" and "Pixel". "File > Open" command, opens the photo as a "Pixel" layer. Dragging photo from a folder to an open document, creates the "Image" layer. To work with pixel selection, the "Image" layer must be converted to the "Pixel" layer (right click, Rasterise).   Image layer allows you to replace images, this is very useful for working with complex design.   Image layer