Site width image
A site wide image is used by web designers typically as main images on web pages where they don’t want to utilise the full width. This can be for design reasons or in a lot of cases where the material available isn’t good enough quality for large, full width images.
This can be any similar ratio such as 11:7 (1100 x 700), 71:40 (1100 x 640) as long as the height isn’t too long.
We use a site width of 1100px although 1200px is now widely used. Therefore 1100px sets our site width image width.