Upload Full Size Images in Picasa

You probably think you know what this post is about.  I doubt it. :-)

Picasa allows you to upload with "Slowest Upload, Largest Size". You might want to do this if you intend to share your photos with friends that might really, really want the full sized images. However, you might have noticed that this doesn't always work. Why not?

The problem could be that you have unsaved edits [1]. When you upload, Picasa assumes you want to upload the edited version, which is probably what you wanted. So it creates a temporary edited file WITH COMPRESSION which it then uploads. Unfortunately, you don't have control over how much compression this temporary file has. So even if you choose "least compression" in the upload dialog, you'll still end up with more compression than if you uploaded the original. The work around is to Export the (edited) photos you want to upload.  You specify the compression applied in the export process.  Then upload the exported photos.

References:

[1] Post by Don Lind