I know and feel your fear..... what about taking the photos your didn't like or use,,,sew them into a demo quilt, just a quick and dirty (as my sons used to say)....with an odd piece of batting and backing,,,,do a super quick quilt on the demo. super quick binding (to protect the batting) and then throw it into that washer and dryer and see what happens..... you wouldn't know for sure what will happen (IMHO) until you try a sample..... and I can appreciate you wanting to protect all your hard work....and the pictures are expensive no matter how you do them.
For what it is worth I have also heard that some printer inks are better than others (like Epson vs HP vs Canon) in staying on the fabric and staying true to color..... Good Luck