In this case, you need a good expert because we all know, there's no place for jokes when it comes to forensic investigations. A quicker and cheaper method can be an online service like
imglarger.com but I don't know if this is good enough in your case. I use it for all my manipulations with images, resize, reshape, and everything else, and I'm very satisfied with how it works for me. You can give it a try to see if it will work for you, maybe it will. Forensic investigations seem like something very interesting for me, and I find this very intriguing, but also this area requires a lot of skills and proficiency.