If you want to duplicate an image in Photoshop, there are a few things you need to know. First, the image must be in a format that Photoshop can understand. This could be a JPEG or PNG file. Second, the dimensions of the image must be correct. The size of the image should be at least 800x600 pixels and no more than 2,000x2,000 pixels. Finally, the file must have a name that Photoshop will recognize. For example, if your original image was called “photo1.jpg,” your duplicate should be called “photo2.jpg.”