When you zoom out on the "aspect ratio", ie the size ratio of the eighth lengths. Or what is the question? Hello, 1000 x 200 pixels corresponds to a ratio of 5:1 and 4000 x 1000 pixel corresponds to a ratio of 4:1. How many pixels do your pictures, does not matter. The ratio must agree, then nothing is distorted. To stay with your example. Turn your picture in a picture resolution of 5000 x 1000 pixels then you can use it as a banner. Perhaps even then reduce to 1000 x 200, so the file size is unnecessarily large.