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Optical defocus can result from incorrect corrective lenses or insufficient accommodation, as, e.g., in presbyopia from the aging eye. As said above, light rays from a point source are then not focused to a single point on the retina but are distributed in a little disk of light, called the blur disk.
In photography (particularly digital photography), purple fringing (sometimes called PF) is the term for an unfocused purple or magenta "ghost" image on a photograph.This optical aberration is generally most visible as a coloring and lightening of dark edges adjacent to bright areas of broad-spectrum illumination, such as daylight or various types of gas-discharge lamps.
The backscatter of the camera's flash by motes of dust causes unfocused orb-shaped photographic artifacts. In photography , backscatter (also called near-camera reflection [ 1 ] ) is an optical phenomenon resulting in typically circular artifacts on an image, due to the camera's flash being reflected from unfocused motes of dust , water ...
The blur circle, of diameter C, in the focused object plane at distance S 1, is an unfocused virtual image of the object at distance S 2 as shown in the diagram. It depends only on these distances and the aperture diameter A, via similar triangles, independent of the lens focal length:
People use raster graphics editors to repair digital images, or to add or replace torn or missing pieces of the physical photograph. Unwanted color casts are removed and the image's contrast or sharpening may be altered to restore the contrast range or detail believed to have been in the original physical image.
Click into the Photos app and scroll to the bottom of the page. There, you will see a tab titled "Customize & Reorder." When you click "Customize & Reorder," your screen will display 11 ...
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