There are a few things you need before starting to make an app icon in Photoshop. First, you will need to create a new document, and then select the App Icon tool from the Tools palette. Next, you will need to enter the following information into the tool’s properties: The dimensions of your icon. This should be in pixels. The color of your icon. You can choose any color you like, but it is important that it is a consistent color across all your apps. The file type of your icon. You can choose PNG or JPEG if you want to save your icons as files with different file types. Finally, you will need to add a reference image for your icon. This image will be used as a model for the final app icon. To do this, select the Image option from the References palette and then click on the link for your reference image.