Why do rulers appear bent, and how to fix?

Started Mar 23, 2011 | Discussions thread
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keqwow
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Why do rulers appear bent, and how to fix?
Mar 23, 2011

I am taking photos of antique artifacts and using a yard stick to have as a
size reference in the photo. Interesting result though...even though the
artifacts appear just fine, the ruler comes out looking bent. I assume it has
something to do with the optics...near the edges of the photo etc. Is there
any software that can correct this effect? I have Photoshop but I am not sure
if this does this or if there even is anything that can fix this effect.

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