After making changes in Picasa preferences with no change in resolution loss (from say, 800kb original image to 235kb after export or upload), I'm at a dead end.
migrated from stackoverflow.com May 20 '10 at 5:42
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Did you choose the original size option for your uploads?
I uploaded an image just to check and the original size was listed at 2.5mp on my machine and afterwards it was listed the same in the Picasa web album.
You can set it to always use the original size under the Tools/Options menu: