Had an issue where the raw images were lost but still have the lightroom previews. I used a couple of techniques to extract the previews and got some usable jpg's back but many are only thumbnails. Is there a way to increase the resolution to at least obtain a printable 4x6 image? there appear to be some methods through photoshop but is there anything in lightroom? Any feedback would be greatly appreciated!!!
Have you tried installing the extractor tool. It should be possible to run the script to pull out larger images than thumbnails, if previews, other than minimal are available.