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  2. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Color constancy: Colour constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and ...

  3. Optical illusion - Wikipedia

    en.wikipedia.org/wiki/Optical_illusion

    Optical illusion is also used in film by the technique of forced perspective . Op art is a style of art that uses optical illusions to create an impression of movement, or hidden images and patterns. Trompe-l'œil uses realistic imagery to create the optical illusion that depicted objects exist in three dimensions.

  4. 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 ...

  5. Chroma key - Wikipedia

    en.wikipedia.org/wiki/Chroma_key

    Chroma key compositing, or chroma keying, is a visual-effects and post-production technique for compositing (layering) two or more images or video streams together based on colour hues ( chroma range). The technique has been used in many fields to remove a background from the subject of a photo or video – particularly the newscasting, motion ...

  6. A 'stunning' discovery: Rare and expensive blue room ... - AOL

    www.aol.com/news/stunning-discovery-rare...

    POMPEII, Italy — Buried and unseen for nearly 2,000 years, a sacred room has been unearthed at Pompeii with painted blue walls, a rare and expensive color in the Roman city. Describing it as a ...

  7. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    Transparency and translucency. Dichroic filters are created using optically transparent materials. In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass through the material without appreciable scattering of light. On a macroscopic scale (one in which the dimensions are ...

  8. Entoptic phenomenon - Wikipedia

    en.wikipedia.org/wiki/Entoptic_phenomenon

    Entoptic phenomena (from Ancient Greek ἐντός (entós) 'within' and ὀπτικός (optikós) 'visual') are visual effects whose source is within the human eye itself. (Occasionally, these are called entopic phenomena, which is probably a typographical mistake.) In Helmholtz 's words: "Under suitable conditions light falling on the eye ...

  9. Egyptian blue - Wikipedia

    en.wikipedia.org/wiki/Egyptian_blue

    Egyptian blue, also known as calcium copper silicate (CaCuSi 4 O 10 or CaOCuO (SiO 2) 4 (calcium copper tetrasilicate)) or cuprorivaite, [1] is a pigment that was used in ancient Egypt for thousands of years. It is considered to be the first synthetic pigment. [2] It was known to the Romans by the name caeruleum.

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