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1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [17] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
Antonio del Pollaiuolo, Portrait of a Young Woman (1470–1472), Museo Poldi Pezzoli, Milan. Facade of Santa Maria Novella (1456) Michelangelo, Doni Tondo (1503–1504). The Florentine Renaissance in art is the new approach to art and culture in Florence during the period from approximately the beginning of the 15th century to the end of the 16th.
The solar camera, employing the focussed light of the sun, addressed the problem in a repurposing of the solar microscope [6] by American portrait artist David Acheson Woodward in 1857, [7] and others, before being superseded by enlargers employing artificial light sources from the 1880s. Life-size portraits made by this means were hand ...
Depending on the sensitization chemistry used, the brightness of the lighting, and the light-concentrating power of the lens, the required exposure time ranged from a few seconds to many minutes. [67] [68] After the exposure was judged to be complete, the lens was capped and the holder was again made light-tight and removed from the camera.
Example of a low-key photograph. Low-key photography is a genre of photography consisting of shooting dark-colored scenes by lowering or dimming the "key" or front light illuminating the scene (low-key lighting), and emphasizing natural [1] or artificial light [2] only on specific areas in the frame. [3]
A red object, for example, will be very pale in the red-filtered image but very dark in the other two images, so the result will be an area with just a trace of cyan, absorbing just a bit of red light, but a large amount of magenta and yellow, which together absorb most of the green and blue light, leaving mainly red light to be reflected back ...
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