This was scanned from a photograph using Vuescan pro. The DNG is labelled muchBigger (50 MB) the other file (big) was obtained from it by opening in Photoshop Elements camera Raw 7.3 and alt-save on the save button. Please could you explain why the large size difference, and where I could have found out the information?
muchBigger:
http://sdrv.ms/16aXDNL

big:
http://sdrv.ms/16aXnhL