Hue

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Hue is one of the main properties (called color performance parameters) of color, technically defined (in the CIECAM02 model), as "the extent to which the stimulus can be described as similar or different from the stimuli described as red, green, blue, and yellow ", (which in particular theory of color vision is called a unique color). The hue can usually be represented quantitatively by a number, often corresponding to the angular position around the central or neutral point or the axis of the colorpace coordinate diagram (like the chromaticity diagram) or the color wheel, or by the dominant wavelength or the complementary color. Other color appearance parameters are color, saturation (also known as intensity or chroma), lightness, and brightness.

Typically, colors of the same color are distinguished by adjectives referring to light or their colors, such as with "light blue", "blue pastel", "blue live". Exceptions include chocolate, which is dark orange.

In color painting theory, color refers to pure pigment - one without color or shadow (added white or black pigment, respectively). The first hues are processed in the brain in areas in V4 called glist.

Video Hue

Komputasi hue

In the color space of the opponent where two axes are orthogonal perception of light, such as CIE 1976 ( L *, a *, b *) (CIELAB ) and 1976 ( L *, u *, v *) (CIELUV) color space, hue can be calculated along with the chroma by altering these coordinates from rectangular shape to polar form. Rona is a component of the polar representation angle, while the chroma is a radial component.

Secara khusus, di CIELAB

${\ displaystyle h_ {ab} = \ mathrm {atan2} (b ^ {*}, a ^ {*}),}  ÂÂ$

sementara, secara analog, di CIELUV

${\ displaystyle h_ {uv} = \ mathrm {atan2} (v ^ {*}, u ^ {*}) = \ mathrm {atan2} (v ', u' ),}  ÂÂ$

where, atan2 is the tangent of two inverted arguments.

Specifies the hue in terms of RGB

Preucil mendeskripsikan hexagon warna, mirip dengan plot trilinear yang dijelaskan oleh Evans, Hanson, dan Brewer, yang dapat digunakan untuk menghitung rona dari RGB. Untuk menempatkan merah pada 0 °, hijau pada 120 °, dan biru pada 240 °,

${\ displaystyle h_ {rgb} = \ mathrm {atan2} \ kiri ({\ sqrt {3}} \ cdot (GB), 2 \ cdot RGB \ right).}  ÂÂ$

Secara ekuivalen, seseorang dapat memecahkannya

${\ displaystyle \ tan (h_ {rgb}) = {\ frac {{\ sqrt {3}} \ cdot (GB)} {2 \ cdot RGB}}.}  ÂÂ$

Preucil uses a polar plot, called the color circle. Using R, G, and B, one can calculate the hue angle using the following scheme: determine which of the six possible sequences of R, G and B applies, then apply the formula given in the table below.

Perhatikan bahwa dalam setiap kasus rumus berisi fraksi ${\ displaystyle {\ frac {M-L} {H-L}}}  ÂÂ$ , di mana H adalah yang tertinggi dari R, G, dan B; L adalah yang terendah, dan M adalah yang pertengahan antara dua lainnya. Ini disebut sebagai "Preucil hue error" dan digunakan dalam perhitungan kekuatan masker dalam reproduksi warna photomechanical.

Angle angle calculated for the Preucil circle corresponds to the hue angle calculated for Hexagon Preucil at multiples of 30 Â ° (red, yellow, green, cyan, blue, magenta, and color between adjacent pairs) and differ about 1.2 Â ° on multiple odd multiples of 15 ° (based on the circle formula), the maximum difference between the two.

The process of converting RGB color to HSL color space or HSV color space is usually based on 6-part piecewise mapping, treating HSV cone as hexacone, or double HSL cone as dual hexacone. The formula used is in the table above.

Maps Hue

Custom hue

The colors exhibited by caramel dyes and beers are limited in range. Linner hona index is used to measure the tint of these products.

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Uses in art

Pigment manufacturers use the word hue, for example, "cadmium yellow (hue)" to show that the original pigmentation material, often toxic, has been replaced with safer (or cheaper) alternatives while retaining its original hue. Replacement is often used for chromium, cadmium and alizarin.

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Hue wavelength vs. dominant

The dominant wavelength (or sometimes equivalent wavelength) is a physical analog to the perceptual attribute hue. In the chromaticity diagram, the line is drawn from the white dot through the color coordinates in question, until it intersects the spectral locus. The wavelength at which the line intersects the spectrum locus is identified as the dominant color wavelength if the point is on the same side of the white dot as the spectral locus, and as the complementary color wavelength if the point is on the opposite side.

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Differences Hue: ${\ displaystyle \ Delta H ^ {*}}$ ?

Ada dua cara utama di mana perbedaan rona dikuantifikasi. Yang pertama adalah perbedaan sederhana antara dua sudut warna. Simbol untuk ekspresi perbedaan rona ini adalah ${\ displaystyle \ Delta h_ {ab}}  ÂÂ$ di CIELAB dan ${\ displaystyle \ Delta h_ {uv}}  ÂÂ$ di CIELUV. Yang lainnya dihitung sebagai perbedaan warna total sisa setelah perbedaan Lightness dan Chroma telah diperhitungkan; simbolnya adalah ${\ displaystyle \ Delta H_ {ab} ^ {*}}  ÂÂ$ di CIELAB dan ${\ displaystyle \ Delta H_ {uv} ^ {*}}  ÂÂ$ di CIELUV.

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Nama dan notasi lainnya

There is some correspondence, more or less precisely, between the hue value and the color term (name). One approach in the science of color is to use traditional color terms but try to give them a more precise definition. View spectral colors # Spectral or near-spectral color tables for very saturated color names with colors from? 0 Â ° (red) to? 275 Â ° (violet), and purple line # Table of deeply saturated purple color for the color of the remaining part of the color wheel.

An alternative approach is to use systematic notation. This can be a standard angle notation for certain color models such as HSL/HSV mentioned above, CIELUV, or CIECAM02. Alphanumeric notations such as the Munsell, NCS, and Pantone Matching System colors are also used.

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See also

• Light (color)
• Chromaticity
• Munsell color system
• Bezold-BrÃÆ'¼cke shifts

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References

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External links

• Edit hue in photography

Source of the article : Wikipedia