If you use Irfan View go with a jpg quality of 85%-90%. Larger dimension images can be saved at lower values with less noticable artifacts. I don't think I would go below 75% though.

I usually upload to the galleries with an image width of 1024 pixels, and I almost always go with about 85%, no matter what program I am using. (the programs I use, all use a percentage slider)

www.irfanview.com  (freeware)

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