Preview posterizes images

This just started happening. All images I show in Preview are posterized. I did not change any settings or install new apps.
Any suggestions as to how to correct this?
Thank you.
Steve G.

Thanks a lot,
this helped a lot. Both switching on the "Ask to keep changes when closing documents" option and reverting to the original in Preview worked fine, and I managed to restore the images that way (the "revert to" option only comes up in preview, though, not when I right-click on the file).
So (auto-)saving changes in Preview seems to cause the problem (i.e. turning images into white, empty files while reducing the file size from 16MB to around 1MB). Now I know how to avoid Autosave (again, thanks!), but I am still wondering why Preview can't save my images properly. Is there any way to fix this without cleaning my system and re-installing everything?
Thanks!

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