The 0 A.D. arts team uploaded a banner for the snap today, as a JPEG file (the PNG versions weighs more than 2MB). Since the 0 A.D. snap is currently featured, the banner is displayed on the store’s home page, but the quality of the banner is visibly degraded compared to the original JPEG that was uploaded. Does the store do some post-processing to reduce the size of the banners? If so, can it be made less aggressive, to preserve image quality?
This is the URL of the banner displayed in the store: https://res.cloudinary.com/canonical/image/fetch/f_auto,q_auto,fl_sanitize,w_1104,h_368/https://dashboard.snapcraft.io/site_media/appmedia/2019/11/flatpackbanner_QKYFlgx.jpg
As a comparison, I’m attaching a JPEG export of the original PNG that I did with gimp, at 90% quality: