All site images are saved at 90 quality in a folder called /_hq jpg so that we can experiment with different levels of quality for the images in /svg/Links.
The reason for this is that we can use Photoshop’s File › Scripts › Image Processor to automatically convert all the high quality images into smaller but useable images both for desktop and mobile versions.
It means that the mobile versions will look much better, being converted only once, and it also means that we can re-convert all the site images in one fell swoop.