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Photometry, from Greek photo- ("light") and -metry ("measure"), is a technique used in astronomy that is concerned with measuring the flux or intensity of light radiated by astronomical objects. This light is measured through a telescope using a photometer, often made using electronic devices such as a CCD photometer or a photoelectric photometer that converts light into an electric current by the photoelectric effect. When calibrated against standard stars of known intensity and colour, photometers can measure the brightness or apparent magnitude of celestial objects.
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Aperture is a discontinued professional image organizer and editor developed by Apple between 2005 and 2015 for the Mac, as a professional alternative to iPhoto.
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TopoFlight is a three-dimensional flight planning software for photogrammetric flights.
Image editing encompasses the processes of altering images, whether they are digital photographs, traditional photo-chemical photographs, or illustrations. Traditional analog image editing is known as photo retouching, using tools such as an airbrush to modify photographs or editing illustrations with any traditional art medium. Graphic software programs, which can be broadly grouped into vector graphics editors, raster graphics editors, and 3D modelers, are the primary tools with which a user may manipulate, enhance, and transform images. Many image editing programs are also used to render or create computer art from scratch. The term "image editing" usually refers only to the editing of 2D images, not 3D ones.
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Astrometric solving or Plate solving or Astrometric calibration of an astronomical image is a technique used in astronomy and applied on celestial images. Solving an image is finding match between the imaged stars and a star catalogue. The solution is a math model describing the corresponding astronomical position of each image pixel. The position of reference catalogue stars has to be known to a high accuracy so an astrometric reference catalogue is used such as the Gaia catalogue. The image solution contains a reference point, often the image centre, image scale, image orientation and in some cases an image distortion model.
Siril is a software application for astrophotography, which allows pre-processing and processing of images from any type of camera. The images must be converted to 32-bit FITS format which is the format used natively by Siril. It is also possible to use the SER format, generally used during "fast" planetary or deep sky acquisitions, without prior conversion.
References
- ↑ Laher, Russ R.; Gorjian, Varoujan; Rebull, Luisa M.; Masci, Frank J.; Fowler, John W.; Helou, George; Kulkarni, Shrinivas R.; Law, Nicholas M. (July 2012). "Aperture Photometry Tool" (PDF). Publications of the Astronomical Society of the Pacific. 124 (917): 737–763. Bibcode:2012PASP..124..737L. doi:10.1086/666883. S2CID 21572643.
- ↑ Laher, Russ R.; Rebull, Luisa M.; Gorjian, Varoujan; et al. (July 2012). "Aperture Photometry Tool Versus SExtractor for Noncrowded Fields" (PDF). Publications of the Astronomical Society of the Pacific. 124 (917): 764–781. Bibcode:2012PASP..124..764L. doi:10.1086/666507. S2CID 44534744.
- ↑ Bertin, E.; Arnouts, S. (June 1996). "SExtractor: Software for Source Extraction". Astronomy and Astrophysics Supplement Series. 117 (2): 393–404. Bibcode:1996A&AS..117..393B. doi: 10.1051/aas:1996164 .
- ↑ "Aperture Photometry Tool News". Aperture Photometry Tool. 12 December 2018. Retrieved 15 December 2018.