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  2. Autumn leaf color - Wikipedia

    en.wikipedia.org/wiki/Autumn_leaf_color

    The phenomenon is commonly called autumn colours [2] or autumn foliage [3] in British English and fall colors, [4] fall foliage, or simply foliage [5] in American English. In some areas of Canada and the United States , " leaf peeping " tourism is a major contribution to economic activity.

  3. Subtractive color - Wikipedia

    en.wikipedia.org/wiki/Subtractive_color

    Subtractive color or subtractive color mixing predicts the spectral power distribution of light after it passes through successive layers of partially absorbing media.

  4. Under color addition - Wikipedia

    en.wikipedia.org/wiki/Under_color_addition

    Under color removal replaces colored inks in selected areas with black ink to achieve a darker appearance, whereas with under color addition, small portions of the three colors are added to these areas instead of, or in addition to, using black ink. UCA is used to reduce the speckle effects of dithering, especially with very light colors.

  5. Additive color - Wikipedia

    en.wikipedia.org/wiki/Additive_color

    James Clerk Maxwell, with his color top that he used for investigation of color vision and additive color. Additive color or additive mixing is a property of a color model that predicts the appearance of colors made by coincident component lights, i.e. the perceived color can be predicted by summing the numeric representations of the component ...

  6. Blend modes - Wikipedia

    en.wikipedia.org/wiki/Blend_modes

    This is the standard blend mode which uses the top layer alone, [3] without mixing its colors with the layer beneath it: [example needed] (,) =where a is the value of a color channel in the underlying layer, and b is that of the corresponding channel of the upper layer.

  7. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    linear scale used for addition, subtraction, and (along with the C and D scales) for finding base-10 logarithms and powers of 10 LL0N (or LL/N) and LLN log-log folded e − x {\displaystyle e^{-x}} and e x {\displaystyle e^{x}} scales, for working with logarithms of any base and arbitrary exponents. 4, 6, or 8 scales of this type are commonly seen.

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