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Mechanical vignetting occurs when light beams emanating from object points located off-axis (laterally or vertically off from the optical axis of an optical system under consideration) are partially blocked by external objects of the optical system such as thick or stacked filters, secondary lenses, and improper lens hoods.
[[:File:Wikipedesketch.png]] File:Wikipedesketch.png. You can make the link say anything you want. [[:File:Wikipedesketch.png|A cartoon centipede reads books and types on a laptop.]] A cartoon centipede reads books and types on a laptop. When the link is clicked the image is displayed with other text information at a reasonable size.
In practice it is hard to take the effects of noise and foreground sources into account. In particular, these foregrounds are dominated by galactic emissions such as Bremsstrahlung, synchrotron, and dust that emit in the microwave band; in practice, the galaxy has to be removed, resulting in a CMB map that is not a full-sky map. In addition ...
Film grain overlay, sometimes referred to as "FGO", is a process in which film emulsion characteristics are overlaid using different levels of opacity onto a digital file. This process adds film grain characteristics, and in instances with moving images, subtle flicker to the more sterile looking digital medium. [citation needed]
Dust astronomy is a subfield of astronomy that uses the information contained in individual cosmic dust particles ranging from their dynamical state to its isotopic, elemental, molecular, and mineralogical composition in order to obtain information on the astronomical objects occurring in outer space.
Clean Backdrop detects and removes dirt, folds, holes, sensor dust, and other details from evenly-colored studio backgrounds. [5] Skin Tone evens out the general hue of the skin and removes redness. [5] [3] White Teeth identifies teeth and adds a natural-looking whitening. [5] [3]
Herschel Space Observatory images of Fomalhaut, analysed in 2012, reveal that a large amount of fluffy micrometer-sized dust is present in the outer dust belt. Because such dust is expected to be blown out of the system by stellar radiation pressure on short timescales, its presence indicates a constant replenishment by collisions of planetesimals.