The resolution of an image is determined by the number of pixels per inch (ppi) it has. In Photoshop, you can open an image and then go to the Image menu and choose Image Size.Ī picture’s dimensions are those of its length and height, which are calculated by adding them together. Another way to change the resolution of an image is to use the Image Size dialog box in Photoshop. This will bring up a dialog box where you can enter the new width and height for the image. With Preview, you can open an image and then click on the Tools menu and choose Adjust Size. One way is to use the Preview app that comes with macOS. It’s easy to change the resolution of an image on a Mac, and there are a few different ways to do it.
