(06-19-2025, 08:12 PM)tinkertool Wrote: Thanks for the replies, it gives me some things to try out.
I am exporting at 50% because I want to post pictures of items for sale on various websites (Facebook marketplace, Craigslist, etc.) and the resulting images seem much smaller and of acceptable quality. Also I may not be capable of telling the difference -- for example in the airliner photo response above I couldn't really see any difference offhand. You can tell I'm not a graphic artist.
What happens with highly compressed jpeg images are "jpeg compression artefacts" You can see in Ofnuts example.
If the website permits webp format, I would try that. For example using Ofnuts png image
png = 200 kb 50Q jpeg = 30 kb 80Q webp = 21 kb