A color wheel or color circle is an organization of color hues around a circle, showing relationships between colors considered to be primary colors, secondary colors, complementary colors, etc.
Artists typically use red, yellow, and blue primaries (RYB color model), so these are arranged at three equally-spaced points around their color wheel. Printers and others who use modern subtractive color methods and terminology use magenta, yellow, and cyan as subtractive primaries.
Color scientists and psychologists often use additive [...]
Entries Tagged as ‘optica’
januari 6, 2009
Color wheel
december 9, 2008
Vesica piscis
The vesica piscis is a shape which is the intersection of two circles with the same radius, intersecting in such a way that the center of each circle lies on the circumference of the other. The name literally means the bladder of the fish in Latin. The shape is also called mandorla (“almond” in Italian).
The term is also used more generally for any symmetric lens
wikipedia
december 9, 2008
Glory (Anthelion)
A glory is an optical phenomenon appearing much like an iconic Saint’s halo about the head of the observer which is produced by light backscattered (a combination of diffraction, reflection and refraction) towards its source by a cloud of uniformly-sized water droplets. The association with a halo is not coincidental, but derivative, though a real glory has multiple colored rings. Most people see only one ring. [...]
december 9, 2008
Halo (optical phenomenon)
A halo (ἅλως; also known as a nimbus, icebow or Gloriole) is an optical phenomenon that appears near or around the Sun or Moon, and sometimes near other strong light sources such as street lights. There are many types of optical halos, but they are mostly caused by ice crystals in cold cirrus clouds located high (5–10 km, or 3–6 miles) in the upper troposphere. The particular shape and orientation of [...]
