When I export my photos and save them as a jpeg. Am I still losing information?

When I export my photos and save them as a jpeg. Am I still losing information? Would I be better of saving them as a TIFF or a PSD? Also I know DNG is a digital negative, would that be the better format to save all my stuff?

I apologize if you already thoroughly know all this (I couldn't be sure):
When you export, you don't change the original (i.e. you never overwrite the original). So, you can export a million times and never lose quality (of the original), regardless of the export formats you choose.
Of course the quality of the export depends on the chosen format, and if the format is lossy (e.g. jpeg), then export quality also depends on the size & quality settings.
TIFF is lossless, so quality is essentially equivalent to the raw in Lightroom. It's the preferred format if a really BIG file is OK. Jpeg was invented to reduce file-size as much as possible without being too much inferior, quality-wise - and it does that very well.
DNG is good for some stuff, but don't export your photos in DNG format unless you know what you are doing and why... Lot's of people like converting their originals to DNG format, but that's a whole different kettle of fish...
Note, it may very well make sense to export a jpeg as tiff, since exporting a jpeg as jpeg is not as good. - reminder: when you export, you are not overwriting the original, you are making a new copy from the original, by combining it with develop edits if there have been any.
Rob

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From: Bill Hunt <[email protected]>
To: Kittie Gugenheim <[email protected]>
Sent: Monday, April 25, 2011 11:46 AM
Subject: Re: Can you edit a person from one photo and add them to another photo?
Welcome to the forum.
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