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Drawing a grid that takes parallax into account over an image
Amigu
Registered User regular
Registered User regular
Hey guys. I need to make percentage coverage estimates from photos like this that have been taken in field:
Of course the photographer hasn’t shot them dead on so the grid that I draw over the area inside the frame needs to be adjusted for parallax. Basically my approach will be to break each side of the frame into 10 and then draw lines from one point to the other to create a grid that warps slightly to accommodate the visual distortion.
It’s fairly easy in principle but I can’t figure out how to do it on photoshop or gimp. I guess I need some kind of vector program. I could do it really easily on CAD but I don’t know how to import the images!
So I was thinking someone could either:
- explain to me how to do it on gimp
-suggest a free program that I can do this with
-suggest an alternative (I guess I could do it by hand!)
Cheers in advanced.
Of course the photographer hasn’t shot them dead on so the grid that I draw over the area inside the frame needs to be adjusted for parallax. Basically my approach will be to break each side of the frame into 10 and then draw lines from one point to the other to create a grid that warps slightly to accommodate the visual distortion.
It’s fairly easy in principle but I can’t figure out how to do it on photoshop or gimp. I guess I need some kind of vector program. I could do it really easily on CAD but I don’t know how to import the images!
So I was thinking someone could either:
- explain to me how to do it on gimp
-suggest a free program that I can do this with
-suggest an alternative (I guess I could do it by hand!)
Cheers in advanced.
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