Book Cover Art
The book’s cover art, which is also known as the marketing image, that appears on iBooks must use RGB color mode and be at least 1400 pixels along the shorter axis. The book’s cover art file must also be a high-quality JPEG with .jpg extension or PNG with .png extension. Do not increase the size of a smaller image to meet the minimum image size dimension standard. Excessively blurry or pixelated images will be rejected.