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  2. Infrared photography - Wikipedia

    en.wikipedia.org/wiki/Infrared_photography

    The majority of black-and-white infrared art, landscape, and wedding photography is done using orange (15 or 21), red (23, 25, or 29) or visually opaque (72) filters over the lens to block the blue visible light from the exposure. The intent of filters in black-and-white infrared photography is to block blue wavelengths and allow infrared to ...

  3. Chromostereopsis - Wikipedia

    en.wikipedia.org/wiki/Chromostereopsis

    Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors, but can also be perceived with red–grey or blue–grey images. [1] [2] Such illusions have been reported for over a century and have generally been attributed to some form of chromatic ...

  4. Seal of the United States Department of Homeland Security

    en.wikipedia.org/wiki/Seal_of_the_United_States...

    The seal is symbolic of the Department's mission – to prevent attacks and protect Americans – on the land, in the sea and in the air. In the center of the seal, a graphically styled white American eagle appears in a circular blue field. The eagle's outstretched wings break through an inner red ring into an outer white ring that contains the ...

  5. History of photography - Wikipedia

    en.wikipedia.org/wiki/History_of_photography

    The first color photograph was a set of three black-and-white photographs taken through red, green, and blue color filters and shown superimposed by using three projectors with similar filters. It was taken by Thomas Sutton in 1861 for use in a lecture by the Scottish physicist James Clerk Maxwell , who had proposed the method in 1855. [ 61 ]

  6. Monochrome photography - Wikipedia

    en.wikipedia.org/wiki/Monochrome_photography

    Monochrome photography is photography where each position on an image can record and show a different amount of light, but not a different hue. It includes all forms of black-and-white photography, which produce images containing shades of neutral grey ranging from black to white. [ 1] Other hues besides grey, such as sepia, cyan, blue, or ...

  7. Grayscale - Wikipedia

    en.wikipedia.org/wiki/Grayscale

    Grayscale images, a kind of black-and-white or gray monochrome, are composed exclusively of shades of gray. The contrast ranges from black at the weakest intensity to white at the strongest. [1] Grayscale images are distinct from one-bit bi-tonal black-and-white images, which, in the context of computer imaging, are images with only two colors ...

  8. Color temperature - Wikipedia

    en.wikipedia.org/wiki/Color_temperature

    Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective body. The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source.

  9. Color symbolism - Wikipedia

    en.wikipedia.org/wiki/Color_symbolism

    Color symbolism in art, literature, and anthropology refers to the use of color as a symbol in various cultures and in storytelling. There is great diversity in the use of colors and their associations between cultures [ 1] and even within the same culture in different time periods. [ 2] The same color may have very different associations ...

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