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by Doxin 1187 days ago
As far as I know just about any file format other than JPEG is better at this. If I recall correctly you basically want to go with GIF if your thumbnail has less than 255 pixels total.
1 comments

just tested this and the jpeg ends up being 690 Bytes while the gif ends up being 2 KB
That can't possibly be right. What size image are you using here?