While the file size of high-resolution images varies greatly, hi-res is typically defined by its pixel dimensions and the number of pixels per inch (PPI or DPI). An image is generally considered high resolution if it has 300 PPI or more, with typical dimensions ranging from 2,000 x 2,000 pixels for smaller images to 5,000 x 5,000 pixels (or more) for larger ones. Keep in mind that the specific pixel requirements will likely depend on the intended use of the image.