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Umbra (A) and penumbra (B) The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast. These names are most often used for the shadows cast by celestial bodies ...
Checker shadow illusion. The regions marked A and B are the same shade of gray. A region of the same shade has been drawn connecting A and B. The checker shadow illusion is an optical illusion published by Edward H. Adelson, professor of vision science at MIT, in 1995. [1]
Shadows from cumulus clouds thick enough to block sunlight. A shadow is a dark area where light from a light source is blocked by an object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two- dimensional silhouette, or a reverse projection of the object blocking ...
Ombré. Ombré: black to blue. Ombré / ˈɒmbreɪ / (literally "shaded" in French) is the blending of one color hue to another, usually moving tints and shades from light to dark. [1] It has become a popular feature for hair coloring, nail art, and even baking, in addition to its uses in home decorating and graphic design. [2]
This recursive ray tracing of reflective colored spheres on a white surface demonstrates the effects of shallow depth of field, "area" light sources, and diffuse interreflection. (c. 2008) In 3D computer graphics, ray tracing is a technique for modeling light transport for use in a wide variety of rendering algorithms for generating digital images.
Opposition surge from the retroreflective lunar soil brightens the area around Buzz Aldrin's shadow during Apollo 11 (photo by Neil Armstrong).. The opposition surge (sometimes known as the opposition effect, opposition spike or Seeliger effect [1]) is the brightening of a rough surface, or an object with many particles, when illuminated from directly behind the observer.
Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear gradually to change colour as the angle of view or the angle of illumination changes. Iridescence is caused by wave interference of light in microstructures or thin films. Examples of iridescence include soap bubbles, feathers, butterfly wings and ...
Microshading is a semi-permanent makeup technique used to enhance the brows. Sometimes referred to as "powder brows" or "ombré brows,” microshading “uses a machine to apply pigment [into the ...