Getting photos from my ipad back to my Mac that are NOT in camera roll.

Question

Our hard drive failed and my back up files were corrupt so I lost my entire digital life including my iphotos.  I had set up my ipad to sync several folders from  iphoto to my ipad when I did an itunes sync.  All of these photos and folders  are currently viewable on my ipad.  When I plug the ipad in to sync, i can only transfer the photos that are currently in the camera roll (355 photos)  There are 5000 photos on the ipad via the folders I previously synced. 
How do I get these photo back to my mac?  Is it even possible?
Image caputer doesn't work because it only looks at the photos in the camera roll (ie taken by the ipad).
To sum up:  Basically starting with a new mac and trying to get photos from the ipad back on the mac.
Thank You!

Answer 1

If you have iPhoto on your iPad, you can save the photos back to the camera roll: you can select complete albums or events at once to do that.
Save photos to the Camera Roll on your iOS device
Tap a photo, album, or event and tap > Camera Roll.
Tap Selected, or change the photos you want to save:
Select different photos: Tap Choose Photos, tap up to 100 photos, and tap Next.
Select a range of photos: Tap Choose Photos, tap Range, tap the first and last photos in the range, and tap Next.
Select all the photos in an album or event: Tap All.
Tap Done.
To use your photo in another app, open the app and select the Camera Roll album.
For other sharing options from iPhoto see:  Ways to share photos
But a third-party app, like Terence Devlin suggested wll probably quicker and safer, since you have 5000 photos to transfer.
my back up files were corrupt
Have you tried data recovery software on your backup drive? Software like
Disk Drill: http://www.cleverfiles.com/
   might still be able to restore jpeg files at least.