My company wanted to make some promotional desktop wallpaper designs for download. These would be for PC/Mac desktop screens, as well as laptops. It would be nice to have mobile versions as well.
What are the standard screen resolutions we would have to design for to cover the most common screen sizes and aspect ratios these days? Can we just make a giant image in the correct ratio and let the users' device resize it down, or do we need to make a number of different variants of the image for each size?