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  2. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    A rarer type, which comes from the Mogok area of Myanmar, features a vanadium chromophore, the same as is present in Verneuil synthetic color-change sapphire. Virtually all gemstones that show the "alexandrite effect" (color change or 'metamerism') show similar absorption/transmission features in the visible spectrum. This is an absorption band ...

  3. Colour recovery - Wikipedia

    en.wikipedia.org/wiki/Colour_recovery

    Black-and-white televisions do not decode this extra colour information in the subcarrier, using only the luminance to provide a monochrome picture. However, because of limited bandwidth in the video channel, the chrominance and luminance signals bleed into each other considerably, causing the colour information to appear as chroma crawl or ...

  4. Color balance - Wikipedia

    en.wikipedia.org/wiki/Color_balance

    An important goal of this adjustment is to render specific colors – particularly neutral colors like white or grey – correctly. Hence, the general method is sometimes called gray balance, neutral balance, or white balance. Color balance changes the overall mixture of colors in an image and is used for color correction. Generalized versions ...

  5. List of monochrome and RGB color formats - Wikipedia

    en.wikipedia.org/wiki/List_of_monochrome_and_RGB...

    This list of monochrome and RGB palettes includes generic repertoires of colors (color palettes) to produce black-and-white and RGB color pictures by a computer's display hardware. RGB is the most common method to produce colors for displays; so these complete RGB color repertoires have every possible combination of R-G-B triplets within any ...

  6. Synthetic alexandrite - Wikipedia

    en.wikipedia.org/wiki/Synthetic_alexandrite

    The Inamori synthetic alexandrite had a cat's eye variety, which showed a distinct color change. The eye was broad and of moderate intensity. Specimens were a dark greyish-green with slightly purple overtones under fluorescent lighting. The eye was slightly greenish-bluish-white and the stones were dull and oily.

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