In addition to the various image sizes defined for resizing images this could be used to create larger additional copies for high-resolution screens with different pixel ratios as used on mobile phones, tablets and modern desktop computers and laptops. The images could use a suffix to the filename which shows the pixel ratio they are targeted at (e.g. image.jpg and image@2x.jpg). The multipliers could be defined in a similar way as additional image sizes in the web.config file.