Scale down thumbnails before saving

[jnvsor]

Currently thumbnails are encoded as full resolution 256bit color low quality jpegs. The contents of the page is still legible, which presents a potential privacy/data-leak issue.

Since the thumbnails are shown in a small box, if they were to be saved as lossless full quality pngs scaled to, say, 2x that size (for high dpi screens) you'd increase the quality, solve the legibility issue, and decrease file size by more than half to boot.

[kesselborn]

Kind of repeating myself here from the other issue:
yeah: I am aware of the problem and a complete rewrite is ongoing ... due to time constraints it won't be before July or August before this comes life.
Once rewritten, all the mentioned issues will be gone ... I currently lack the time to do a hotfix for the current version :/
Thanks for the detailed report though