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- Lab_color_space abstract "A Lab color space is a color-opponent space with dimension L for lightness and a and b for the color-opponent dimensions, based on nonlinearly compressed (e.g. CIE XYZ color space) coordinates. The terminology originates from the three dimensions of the Hunter 1948 color space, which are L, a, and b. However, Lab is now more often used as an informal abbreviation for the L-a-b representation of the CIE 1976 color space (or CIELAB, described below). The difference between the original Hunter and CIE color coordinates is that the CIE coordinates are based on a cube root transformation of the color data, while the Hunter coordinates are based on a square root transformation. Other examples of color spaces with Lab representations include the CIE 1994 color space and the CIE 2000 color space.The L*a*b* color space includes all perceivable colors, which means that its gamut exceeds those of the RGB and CMYK color models (for example, ProPhoto RGB includes about 90% all perceivable colors). One of the most important attributes of the L*a*b*-model is device independence. This means that the colors are defined independent of their nature of creation or the device they are displayed on. The L*a*b* color space is used when graphics for print have to be converted from RGB to CMYK, as the L*a*b* gamut includes both the RGB and CMYK gamut. Also it is used as an interchange format between different devices as for its device independency. The space itself is a three-dimensional Real number space, that contains an infinite possible representations of colors. However, in practice, the space is usually mapped onto a three-dimensional integer space for device-independent digital representation, and for these reasons, the L*, a*, and b* values are usually absolute, with a pre-defined range. The lightness, L*, represents the darkest black at L* = 0, and the brightest white at L* = 100. The color channels, a* and b*, will represent true neutral gray values at a* = 0 and b* = 0. The red/green opponent colors are represented along the a* axis, with green at negative a* values and red at positive a* values. The yellow/blue opponent colors are represented along the b* axis, with blue at negative b* values and yellow at positive b* values. The scaling and limits of the a* and b* axes will depend on the specific implementation of Lab color, as described below, but they often run in the range of ±100 or −128 to +127.Both the Hunter and the 1976 CIELAB color spaces were derived from the prior "master" space CIE 1931 XYZ color space, which can predict which spectral power distributions will be perceived as the same color (see metamerism), but which is not particularly perceptually uniform. Strongly influenced by the Munsell color system, the intention of both "Lab" color spaces is to create a space that can be computed via simple formulas from the XYZ space but is more perceptually uniform than XYZ. Perceptually uniform means that a change of the same amount in a color value should produce a change of about the same visual importance. When storing colors in limited precision values, this can improve the reproduction of tones. Both Lab spaces are relative to the white point of the XYZ data they were converted from. Lab values do not define absolute colors unless the white point is also specified. Often, in practice, the white point is assumed to follow a standard and is not explicitly stated (e.g., for "absolute colorimetric" rendering intent, the International Color Consortium L*a*b* values are relative to CIE standard illuminant D50, while they are relative to the unprinted substrate for other rendering intents).The lightness correlate in CIELAB is calculated using the cube root of the relative luminance.".
- Lab_color_space thumbnail Lab_color_space.png?width=300.
- Lab_color_space wikiPageExternalLink cielab03022003.pdf.
- Lab_color_space wikiPageExternalLink a_spaces.html.
- Lab_color_space wikiPageExternalLink lab-color.html.
- Lab_color_space wikiPageExternalLink Intro_Solid_Color.pdf.
- Lab_color_space wikiPageID "365159".
- Lab_color_space wikiPageLength "22976".
- Lab_color_space wikiPageOutDegree "82".
- Lab_color_space wikiPageRevisionID "683246494".
- Lab_color_space wikiPageWikiLink Absolute_color_space.
- Lab_color_space wikiPageWikiLink Acronym.
- Lab_color_space wikiPageWikiLink Adams_chromatic_valence_color_space.
- Lab_color_space wikiPageWikiLink Adobe_Photoshop.
- Lab_color_space wikiPageWikiLink Adobe_RGB_color_space.
- Lab_color_space wikiPageWikiLink Blend_modes.
- Lab_color_space wikiPageWikiLink CIECAM02.
- Lab_color_space wikiPageWikiLink CIELUV.
- Lab_color_space wikiPageWikiLink CIELUV_color_space.
- Lab_color_space wikiPageWikiLink CIE_1931_color_space.
- Lab_color_space wikiPageWikiLink CIE_Standard_Illuminant_D65.
- Lab_color_space wikiPageWikiLink CIE_XYZ.
- Lab_color_space wikiPageWikiLink CIE_XYZ_color_space.
- Lab_color_space wikiPageWikiLink CMYK_color_model.
- Lab_color_space wikiPageWikiLink Category:Color_space.
- Lab_color_space wikiPageWikiLink Chromaticity.
- Lab_color_space wikiPageWikiLink Chrominance.
- Lab_color_space wikiPageWikiLink Color_appearance_model.
- Lab_color_space wikiPageWikiLink Color_appearance_phenomena.
- Lab_color_space wikiPageWikiLink Color_difference.
- Lab_color_space wikiPageWikiLink Color_management.
- Lab_color_space wikiPageWikiLink Color_solid.
- Lab_color_space wikiPageWikiLink Color_space.
- Lab_color_space wikiPageWikiLink Color_theory.
- Lab_color_space wikiPageWikiLink Color_vision.
- Lab_color_space wikiPageWikiLink Colorfulness.
- Lab_color_space wikiPageWikiLink Curve_(tonality).
- Lab_color_space wikiPageWikiLink Dan_Margulis.
- Lab_color_space wikiPageWikiLink Euclidean_distance.
- Lab_color_space wikiPageWikiLink Gamut.
- Lab_color_space wikiPageWikiLink HSL_and_HSV.
- Lab_color_space wikiPageWikiLink Helmholtz–Kohlrausch_effect.
- Lab_color_space wikiPageWikiLink Hue.
- Lab_color_space wikiPageWikiLink ICC_profile.
- Lab_color_space wikiPageWikiLink Illuminant_D65.
- Lab_color_space wikiPageWikiLink Imaginary_color.
- Lab_color_space wikiPageWikiLink Impossible_color.
- Lab_color_space wikiPageWikiLink Initialism.
- Lab_color_space wikiPageWikiLink International_Color_Consortium.
- Lab_color_space wikiPageWikiLink International_Commission_on_Illumination.
- Lab_color_space wikiPageWikiLink Lamberts_cosine_law.
- Lab_color_space wikiPageWikiLink Lamberts_law.
- Lab_color_space wikiPageWikiLink Lightness.
- Lab_color_space wikiPageWikiLink Lightness_(color).
- Lab_color_space wikiPageWikiLink Luminance_(relative).
- Lab_color_space wikiPageWikiLink Metamerism_(color).
- Lab_color_space wikiPageWikiLink Munsell.
- Lab_color_space wikiPageWikiLink Munsell_color_system.
- Lab_color_space wikiPageWikiLink OS_X.
- Lab_color_space wikiPageWikiLink Opponent_color.
- Lab_color_space wikiPageWikiLink Opponent_process.
- Lab_color_space wikiPageWikiLink PDF.
- Lab_color_space wikiPageWikiLink Portable_Document_Format.
- Lab_color_space wikiPageWikiLink ProPhoto_RGB_color_space.
- Lab_color_space wikiPageWikiLink RGB_color_model.
- Lab_color_space wikiPageWikiLink Real_number.
- Lab_color_space wikiPageWikiLink Relative_luminance.
- Lab_color_space wikiPageWikiLink Rendering_intent.
- Lab_color_space wikiPageWikiLink Richard_S._Hunter.
- Lab_color_space wikiPageWikiLink SRGB.
- Lab_color_space wikiPageWikiLink SRGB_color_space.
- Lab_color_space wikiPageWikiLink Spectral_power_distribution.
- Lab_color_space wikiPageWikiLink Standard_illuminant.
- Lab_color_space wikiPageWikiLink TIFF.
- Lab_color_space wikiPageWikiLink Tagged_Image_File_Format.
- Lab_color_space wikiPageWikiLink Tristimulus.
- Lab_color_space wikiPageWikiLink White_point.
- Lab_color_space wikiPageWikiLink File:Example_of_LAB_color_enhancement.jpg.
- Lab_color_space wikiPageWikiLink File:Lab_color_space.png.
- Lab_color_space wikiPageWikiLinkText ""L value"".
- Lab_color_space wikiPageWikiLinkText "''L''ab color space".
- Lab_color_space wikiPageWikiLinkText "CIE (L*, a*, b*)".
- Lab_color_space wikiPageWikiLinkText "CIE 1976 L*a*b* and L*u*v* color spaces".
- Lab_color_space wikiPageWikiLinkText "CIE 1976".
- Lab_color_space wikiPageWikiLinkText "CIE L*a*b* color space".
- Lab_color_space wikiPageWikiLinkText "CIE Lab color space".
- Lab_color_space wikiPageWikiLinkText "CIE*Lab".
- Lab_color_space wikiPageWikiLinkText "CIELAB (H,C,L)".
- Lab_color_space wikiPageWikiLinkText "CIELAB (“L*a*b*”)".
- Lab_color_space wikiPageWikiLinkText "CIELAB color space".
- Lab_color_space wikiPageWikiLinkText "CIELAB".
- Lab_color_space wikiPageWikiLinkText "Hunter Lab".
- Lab_color_space wikiPageWikiLinkText "L*A*B*".
- Lab_color_space wikiPageWikiLinkText "L*a*b color space".
- Lab_color_space wikiPageWikiLinkText "L*a*b".
- Lab_color_space wikiPageWikiLinkText "L*a*b* color space".
- Lab_color_space wikiPageWikiLinkText "L*a*b*".
- Lab_color_space wikiPageWikiLinkText "LAB".
- Lab_color_space wikiPageWikiLinkText "LCH".
- Lab_color_space wikiPageWikiLinkText "Lab color space".