Really appreciate the quick and thorough response. I now understand how it works and how to get the images from the datasets. I was able to download a sample .img file from the Viking Orbiter data, but I am having some trouble viewing it in Photoshop. I changed the file extension to RAW as suggested in an online tutorial I found, but then it seems I need to adjust certain values in order to process the image properly.
Would there be a simpler image tool that you would recommend to open the RAW image files without having to adjust header values and such? Or will this always be the case with these kind of RAW images?