The exact image sizes are as follows:
Please note that the theme comes with a dynamic image resizer that will automatically stretch or shrink any image you upload. However, you should make sure that you use images that are exact or close to the sizes listed above, because if the image is too small or too large for the area, the resized version will appear fuzzy or pixelated.
Also keep in mind that the ideal number of pixels is 72dpi but you shouldn’t worry about that too much, as most stock photos have a great picture quality that you can use without having to modify.
If you would like more information on how to edit images, please watch this video.