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2. Petzval field curvature - Wikipedia

   en.wikipedia.org/wiki/Petzval_field_curvature

   Field curvature: the image "plane" (the arc) deviates from a flat surface (the vertical line). Petzval field curvature, named for Joseph Petzval, [1] describes the optical aberration in which a flat object normal to the optical axis (or a non-flat object past the hyperfocal distance) cannot be brought properly into focus on a flat image plane.

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4. Field flattener lens - Wikipedia

   en.wikipedia.org/wiki/Field_Flattener_Lens

   The object in designing a field flattening lens is to create a lens that shifts the focal points of the Petzval surface to lie in the same plane. Consider inserting a pane of glass in a focusing beam. Due to refraction, the focal point of the beam is shifted by dependent on the thickness of the glass. Thus we have a thickness as a function of ...

5. Perspective distortion - Wikipedia

   en.wikipedia.org/wiki/Perspective_distortion

   In the fourth image at the lower right, taken with the widest lens, the building behind the object appears much further away than in reality. Photos taken using a 35 mm camera with a 100 mm, a 70 mm, a 50 mm, and a 28 mm lens, at different distances from the subject.

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   en.wikipedia.org/wiki/Fatpaint

   Fatpaint is a free, online graphic design and desktop publishing software product and image editor. It includes integrated tools for creating page layout , painting, coloring and editing pictures and photos , drawing vector images , using dingbat vector clipart , writing rich text , creating ray traced 3D text logos and displaying graphics on ...

7. Phantogram (optical illusion) - Wikipedia

   en.wikipedia.org/wiki/Phantogram_(optical_illusion)

   Phantograms, also known as Phantaglyphs, Op-Ups, free-standing anaglyphs, levitated images, and book anaglyphs, are a form of optical illusion.Phantograms use perspectival anamorphosis to produce a 2D image that is distorted in a particular way so as to appear, to a viewer at a particular vantage point, three-dimensional, standing above or recessed into a flat surface.

8. Flat-field correction - Wikipedia

   en.wikipedia.org/wiki/Flat-field_correction

   Flat-field correction (FFC) is a digital imaging technique to mitigate the image detector pixel-to-pixel sensitivity and distortions in the optical path. It is a standard calibration procedure in everything from personal digital cameras to large telescopes.

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