So I carelessly wiped clean my old iPad before copying all the photos from it. A lot of them did not exist elsewhere (transferred from a digital camera and then cleared the memory card), so I wanted to recover them. There was an iTunes backup of the iPad still on my Windows 7 computer, in a folder under c:\Users\<UserName>\AppData\Roaming\Apple Computer\MobileSync\Backup
Some paid software offered to make it easy on me, but to try and save about $25 I figured I would try another route. Searching on the net revealed that Apples stores the photos as individual files, but with different file extensions, which makes things easier. I mass renamed all of them in an old school DOS prompt command window with “REN *.* *.JPG”. Thumbnail view in Windows file explorer, sorted by size to try and get the photos generally grouped together, let me pick out what I wanted. Happy day! This ought to work on an iPhone as well.