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Example of White's illusion. White's illusion is a brightness illusion in which certain stripes of a black-and-white grating are replaced by gray rectangles (see the figure). Both of the gray bars of A and B have the same color, luminance, and opacity. The brightness of the gray rectangles appears to be closer to the brightness of the top and ...
A second induction image for the McCollough effect. Stare at the center of this image for a few seconds, then at the center of the image to the left (with the red background) for a few seconds. Then return to this image. Keep looking between the two colored images for at least three minutes. A test image for the McCollough effect. On first ...
Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of light.
Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect. [1] "Halftone" can also be used to refer specifically to the image that is produced by this process. [1]
Several things can happen, then, to the absorbed energy: It may be re-emitted by the electron as radiant energy (in this case, the overall effect is in fact a scattering of light), dissipated to the rest of the material (i.e., transformed into heat), or the electron can be freed from the atom (as in the photoelectric effects and Compton effects).
Electromagnetically induced transparency (EIT) is a coherent optical nonlinearity which renders a medium transparent within a narrow spectral range around an absorption line. Extreme dispersion is also created within this transparency "window" which leads to " slow light ", described below.
The low-pressure sodium arc discharge lamp was first made practical around 1920 owing to the development of a type of glass that could resist the corrosive effects of sodium vapor. These operated at pressures of less than 1 Pa and produced a near monochromatic light spectrum around the sodium emission lines at 589.0 and 589.56 nanometres ...
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