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  2. Reverse-contrast typefaces - Wikipedia

    en.wikipedia.org/wiki/Reverse-contrast_typefaces

    Several Italian designs were released as wood type from 1837 onwards. [7] Several digitisations of the Italian style have been made. Peter Biľak's Karloff is a family of normal and matching reverse-contrast fonts with upper- and lower-case, together with a low-contrast slab serif design, all with the same basic structure. Biľak and his ...

  3. Williams process - Wikipedia

    en.wikipedia.org/wiki/Williams_process

    The Williams process relies on the properties of film. Firstly, the actors were filmed in front of a black background—although white or blue backgrounds were used later—and that was printed on high contrast film several times until a copy known as the holdout matte was achieved, which showed the black silhouette of the actors over a completely white background.

  4. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The dress was a viral phenomenon, which was either seen as blue and black or as white and gold. Its true colours were eventually confirmed to be blue and black. [2] Ebbinghaus illusion: The Ebbinghaus illusion, or Titchener circles, is an optical illusion of relative size perception. The two orange circles are exactly the same size; however ...

  5. Contrast (vision) - Wikipedia

    en.wikipedia.org/wiki/Contrast_(vision)

    Contrast is the difference in luminance or color that makes an object (or its representation in an image or display) visible against a background of different luminance or color. [1] The human visual system is more sensitive to contrast than to absolute luminance; thus, we can perceive the world similarly despite significant changes in ...

  6. Grayscale - Wikipedia

    en.wikipedia.org/wiki/Grayscale

    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: black and white (also called bilevel or binary images). Grayscale images have many shades of gray in between.

  7. Ambiguous image - Wikipedia

    en.wikipedia.org/wiki/Ambiguous_image

    However, the brain undergoes deeper processing to resolve the ambiguity. For example, consider an image that involves an opposite change in magnitude of luminance between the object and the background (e.g. From the top, the background shifts from black to white, and the object shifts from white to black).

  8. Negative (photography) - Wikipedia

    en.wikipedia.org/wiki/Negative_(photography)

    Film negatives usually have less contrast, but a wider dynamic range, than the final printed positive images. The contrast typically increases when they are printed onto photographic paper. When negative film images are brought into the digital realm, their contrast may be adjusted at the time of scanning or, more usually, during subsequent ...

  9. Chromostereopsis - Wikipedia

    en.wikipedia.org/wiki/Chromostereopsis

    Blue–red contrast demonstrating depth perception effects 3 Layers of depths "Rivers, Valleys & Mountains". 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.