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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [23] A COS tree file consists primarily of objects, of which there are nine types: [16] Boolean values, representing true or false; Real numbers ...

  3. Biological pigment - Wikipedia

    en.wikipedia.org/wiki/Biological_pigment

    Pigment color differs from structural color in that it is the same for all viewing angles, whereas structural color is the result of selective reflection or iridescence, usually because of multilayer structures. For example, butterfly wings typically contain structural color, although many butterflies have cells that contain pigment as well. [3]

  4. Munsell color system - Wikipedia

    en.wikipedia.org/wiki/Munsell_color_system

    The Munsell color system, showing: a circle of hues at value 5 chroma 6; the neutral values from 0 to 10; and the chromas of purple-blue (5PB) at value 5. In colorimetry, the Munsell color system is a color space that specifies colors based on three properties of color: hue (basic color), value (lightness), and chroma (color intensity).

  5. Human skin color - Wikipedia

    en.wikipedia.org/wiki/Human_skin_color

    This is an accepted version of this page This is the latest accepted revision, reviewed on 5 September 2024. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...

  6. Structural coloration - Wikipedia

    en.wikipedia.org/wiki/Structural_coloration

    Structural coloration in animals, and a few plants, is the production of colour by microscopically structured surfaces fine enough to interfere with visible light instead of pigments, although some structural coloration occurs in combination with pigments. For example, peacock tail feathers are pigmented brown, but their microscopic structure ...

  7. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to ...

  8. Melanosome - Wikipedia

    en.wikipedia.org/wiki/Melanosome

    A melanosome is an organelle found in animal cells and is the site for synthesis, storage and transport of melanin, the most common light-absorbing pigment found in the animal kingdom. Melanosomes are responsible for color and photoprotection in animal cells and tissues. Melanosomes are synthesised in the skin in melanocyte cells, as well as ...

  9. Dye - Wikipedia

    en.wikipedia.org/wiki/Dye

    Dye. Drying colored cloth. Chemical structure of indigo dye, the blue coloration of blue jeans. Although once extracted from plants, indigo dye is now almost exclusively synthesized industrially. [1] A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do ...