A community about game development.
Rules:
More rules might follow if they become necessary; general rule is don't be a pain in the butt. Have fun! ♥
Two ideas:
Have you tried taking the photo from farther away? The center of a photograph has the least distortion
Photoshop has a lens distortion fixer thing. Been a long time since I did photo editing so forgive me for not being more specific but I recall it doing a pretty decent job when I needed it.
You'll want the most even and flat lighting possible, so pick an overcast day if it's outside, or use soft/diffuse lights if it's inside.
I read something about someone capturing normal maps by bringing a torch and taking pictures of their texture/material from the exact same angle (use a tripod) and lighting it from above, below, to the left, and right, and then somehow using those to make a normal map by using those pictures as colour channels to build up a normal texture. Sorry if that's really vague. It's all I can remember at the moment.
Edit: I found it. The article uses some old tools but I imagine the process is similar.