Just a few weeks ago my family lost my great uncle Joe. My mother found the only know photo of him and my grandmother together were he is in a suit dressed nice.
The issue is that it is a photo, and I want to blow it up to 8*10 for my grandmother..
Is there any trick to do this?
It would mean the world to my grandmother to have a good print of this photo as no one knows that it exists.

Never, never.
