Hot answers tagged distortion
It's not so much a defect as a property of wide-angle lenses: they distort things on the sides. This distortion is why they are not recommended for portraiture. Of course, the very same distortion is what gives wide-angle its power, making it great for photographing interiors (making them look larger) or when going for an "artsy" effect.
Two things common to Wide angle lenses can do this, barrel distortion and perspective distortion. For barrel distortion, when pulling in a very wide amount of information from off axis, light gets distorted based on how extreme of an angle it is coming in at because the lens can't completely correct for how far off the lens axis the light is. On the ...
from http://wiki.panotools.org/Lens_correction_model The actual lens correction parameters a, b and c which are used to correct for barrel distortion, pincushion distortion and even wavy distortion. The a and c parameters control more complex forms of distortion. In most cases it will be enough to optimize for the b parameter only, which is good at ...
There are several problems transforming the curvilinear perspective of the wide angle GoPro lens to a rectilinear one. The transformation stretches the image in certain areas and compresses it in others. This lowers the image quality as new pixels are created as approximations and interpolations from the information in the original image. There is also a ...
Yes, wide angle lens distortion is the source here, but not the reason why those heads appear stretched so much. If we had the original photo as the lens imaged it on the sensor of the camera, we would see much less stretched heads and more of perspective and barrel distortion. Correcting for the variety of distortions in post, or in some cases in-camera, ...
All the answers are great here --- let me just add than when you apply any correction, you are doing image transformations that put pixels where there were none before --- interpolating and so. So there is some inevitable loss do to the nature itself of the operation, like when you upsize an image. There is a really technical and good article by Roger ...
Like all things in life, you need to make a choice: The TV or the girl(s)? Also, consider how something polar, like the earth is displayed as a flat map? How warped is that?
Try using Darktable instead. The 'lens correction' module shown above should help remove the fisheye effect. If your lens is in the database it can automatically make the correction, or if not you may adjust manually.
Unfortunately, Aperture doesn't have built in automatic lens distortion- you need to buy the plugin PTLens, ~$25.
Simply put, the distortion isn't so much a result of the lens as it is the angle of view. Since you are seeing things that are almost directly out to the side, you are seeing them from the side rather than the front. You can apply a rectilinear correction, but doing so will result in forcing the perspective to not match up with what you are actually seeing ...
The package RawTherapee, since version 4.0.9, will use Adobe .lcp profiles. Please see: http://rawtherapee.com/blog/rawtherapee-4.0.9-released Support for Adobe LCP lens correction profiles It is available in the Ubuntu repositories.
I found the following instructions which helped me achieve what I was looking for: http://m43photo.blogspot.de/2012/03/defishing-fisheye-images.html http://m43photo.blogspot.de/2014/07/olympus-9mm-fisheye-vs-rectilinear.html For my lens I found the following parameters useful: Lens type: Full frame Fisheye Focal length: 9mm Focal length multiplier: 2.2 ...
Hard to see what you're asking. A given focal length and composition will always have the same character due to laws of optics. You're always going to see that effect, it has nothing to do with the subject. If you're asking whether some people look good that way, then yes of course they do — but that's your responsibility as the artist to make that happen. ...
Hopefully this illustration of a pin hole camera will clarify:
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