There are several ways to do this in Lightroom. I will outline two of them.
New catalog
- Create a new catalog
- Import all the RAW files you want a JPEG version of.
- Select them all in
Grid view
, right click, and export them as JPEG.
Virtual copy
- In your current catalog select all the RAW files you want undeveloped versions of.
- In
Grid view
right click and click Create Virtual Copies
.
- Now create a
Smart Collection
that searches for files with the Copy Name
that isn't empty
. This will give you all the virtual copies in the catalog.
- Select the all the virtual copies that need to be undeveloped.
- Go to
Settings -> Enable Auto Sync
.
- Go to
Settings -> Reset All Settings
.
Some notes:
The moment you export the RAW image as a JPEG you're already altering the photo. The alteration depends on the RAW converter used.
If you've custom defaults set-up that are coupled to ISO settings or a camera serial number, the above methods will not work as the image will be developed by default settings based on ISO or serial number.
If Lightroom is not a hard restriction you can also use a command line tool called ImageMagick. This answer on Superuser contains the necessary commands (adapt the RAW file extension to your situation).
To convert a single .NEF:
convert foo.NEF foo.jpg
To convert all .NEF files in the current directory:
mogrify -format jpg *.NEF