Really! It's all because of the lens. When an image is focused onto the sensor or film, it has to pass through a curved surface, and basic trigonometry demands that the XY coordinates of the flattened image are not in proportion. You would have to project onto a curved sensor to fix that. But a digital camera could automatically do lens distortion corrections. I am not aware of any in-camera lens distortion software. Hopefully you can tell me and other readers if you know of any cameras that offer it.
But there is some software which will automatically correct lens distortion in the digital darkroom. PTLens is software that corrects lens pincushion/barrel distortion, vignetting, chromatic aberration, and perspective. It recognises many commercially available lenses and exists as a stand alone application or a plugin for photoshop.
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spOOk's art is owned by Jeremy. He has practiced drawing and painting for about 40 years, and might get good at it one day. spOOk's art is focused on graphite portraits.