At the moment images are downsampled to around display resolution on image load so for example if we have an image that is 3840 x 2160 (4k) getting loaded but our display / monitor is only 1080p, roseate will automatically downsample that image to 1920x1080 (plus some extra pixels).

This is great until we start zooming into the image and notice all the clarity we have lost, so let's dynamically adjust the downsampling when the user zooms in/out.

However this will need to be done in the background hence we will need #24 to be completed first.