Originally posted by hadi i was using photoshop and camera raw and bridge i was using RAW images i was editing them images once the stitch was complete. then turning it into jpeg.
There are two problems with doing it in this sequence. First, the RAW images that you are stitching won't be corrected for exposure, WB, distortion, vignetting, etc. It would be much more difficult to make those kinds of corrections to a stitched RAW image than making them first to the original image. Second, your processing program would be trying to cope with a huge file.
Like @thazoo, I process RAW files with the same WB and so on, export to TIFF, and stitch the TIFF files (although in one go not in lines). I use Microsoft ICE. Then I export to jpg at some manageable size.
Maybe I should try the alternative of exporting to jpg from the RAW processor and stitching the jpg files. The only thing I would be concerned about would be degradation in re-saving to the final jpg.
I'm struggling to get my head around stitching 30 images for a portrait. Even assuming it's a group shot, or an environmental portrait, or Brenizer pano, that seems like a lot. Perhaps you would get adequate coverage of the scene by using a selected subset of the photos?