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2. DxO ViewPoint - Wikipedia

   en.wikipedia.org/wiki/DxO_ViewPoint

   DxO ViewPoint's volume distortion correction can be used to attempt to recover the natural proportions of objects that have been distorted due to their proximity to the edge of the frame when photographed with a wide-angle lens.

3. Perspective control - Wikipedia

   en.wikipedia.org/wiki/Perspective_control

   It is commonly suggested [citation needed] to correct perspective using a general projective transformation tool, correcting vertical tilt (converging verticals) by stretching out the top; this is the "Distort Transform" in Photoshop, and the "perspective tool" in GIMP.

4. Distortion (optics) - Wikipedia

   en.wikipedia.org/wiki/Distortion_(optics)

   Photoshop CS2 and Photoshop Elements (from version 5) include a manual Lens Correction filter for simple (pincushion/barrel) distortion; Corel Paint Shop Pro Photo includes a manual Lens Distortion effect for simple (barrel, fisheye, fisheye spherical and pincushion) distortion. GIMP includes manual lens distortion correction (from version 2.4).

5. Diplopia - Wikipedia

   en.wikipedia.org/wiki/Diplopia

   Specialty. Neurology, ophthalmology. Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally or vertically in relation to each other. [1] Also called double vision, it is a loss of visual focus under regular conditions, and is often voluntary.

6. Pentamirror - Wikipedia

   en.wikipedia.org/wiki/Pentamirror

   Pentamirror. A roof pentamirror contains 3 mirrors. A pentamirror is an optical device used in the viewfinder systems of various single-lens reflex cameras instead of the pentaprism. It is used to reverse again the laterally reversed image coming from the reflex mirror. [1]

7. Aperture (software) - Wikipedia

   en.wikipedia.org/wiki/Aperture_(software)

   Aperture also offers a range of image adjustment tools, including specific color retouching, a luminance-based edge sharpener, and spot repair. It also has lens correction tools, such as chromatic aberration correction, to help improve the overall quality of an image.