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[Utility & Helpers](/categories/utility) 4. / 5. itwmw/color-difference ActiveLibrary[Utility & Helpers](/categories/utility) itwmw/color-difference ====================== Color difference：Din99,CIE76,CIE1994,CIEDE2000,CMC l:c v1.2.0(4y ago)178.7k2Apache-2.0PHPPHP ^8.1 Since Jan 13Pushed 4y agoCompare [ Source](https://github.com/MicroDreamTeam/color-difference)[ Packagist](https://packagist.org/packages/itwmw/color-difference)[ RSS](/packages/itwmw-color-difference/feed)WikiDiscussions master Synced 1mo ago READMEChangelogDependencies (2)Versions (4)Used By (0) Color Difference ---------------- [](#color-difference) [![License](https://camo.githubusercontent.com/fcf4570a2adf8061b3023c389ed17da04ab1ab9f14ca2b960b75e6c65ee6849c/68747470733a2f2f69636f6e2e6974776d772e636f6d2f62616467652f4c6963656e73652d4170616368652d2d322e302d626c7565)](https://camo.githubusercontent.com/fcf4570a2adf8061b3023c389ed17da04ab1ab9f14ca2b960b75e6c65ee6849c/68747470733a2f2f69636f6e2e6974776d772e636f6d2f62616467652f4c6963656e73652d4170616368652d2d322e302d626c7565)[![PHP Version Support](https://camo.githubusercontent.com/6acb94f640a0588dacfde4ce7e34faff4da8f2a85a8942b4a411477f90389391/68747470733a2f2f69636f6e2e6974776d772e636f6d2f62616467652f5048502d253545382e312d677265656e3f6c6f676f3d706870266c6f676f436f6c6f723d76696f6c6574)](https://camo.githubusercontent.com/6acb94f640a0588dacfde4ce7e34faff4da8f2a85a8942b4a411477f90389391/68747470733a2f2f69636f6e2e6974776d772e636f6d2f62616467652f5048502d253545382e312d677265656e3f6c6f676f3d706870266c6f676f436f6c6f723d76696f6c6574) A library for calculating the perceptual difference between colors (∆E). The difference or distance between two colors is a metric of interest in color science. It allows quantified examination of a notion that formerly could only be described with adjectives. Quantification of these properties is of great importance to those whose work is color-critical. Common definitions make use of the Euclidean distance in a device independent color space. The following measurements are supported: - Euclidean - Weighted Euclidean - DIN99 (2007) - CIE76 (1976) - CIE94 (1994) - CIEDE2000 (2000) - CMC l:c (1984) All calculations are performed in either L\*a\*b\* or L\*C\*H\* space (as the metrics prescribe). Quick Start ----------- [](#quick-start) This library is available on packagist, like so: ``` composer require itwmw/color-difference ``` Usage ----- [](#usage) The color difference metrics are implemented via the following functions: - Euclidean RGB `getDifferenceEuclideanRGB(Color $color): float` - Euclidean Lab `getDifferenceEuclideanLab(Color $color): float` - Weighted Euclidean RGB `getDifferenceWeightedEuclideanRGB(Color $color): float` - Din99 `getDifferenceDin99(Color $color): float` - CIE76: `getDifferenceCIE76(Color $color): float` - CIE94: `getDifferenceCIE94(Color $color, CIE94 $type = CIE94::GraphicArts): float` - CIEDE2000: `getDifferenceCIEDE2000(Color $color): float` - CMC l:c: `getDifferenceCMC(Color $color, CMC $type = CMC::Imperceptibility): float` ``` use Itwmw\ColorDifference\Color; use Itwmw\ColorDifference\Lib\RGB; use Itwmw\ColorDifference\Support\CIE94; use Itwmw\ColorDifference\Support\CMC; $color = new Color(new RGB(255, 183, 255)); $color2 = new Color(new RGB(55, 65, 53)); echo('Din99:' . $color->getDifferenceDin99($color2) . "\n"); echo('CIE76:' . $color->getDifferenceCIE76($color2) . "\n"); echo('CIE94-GraphicArts:' . $color->getDifferenceCIE94($color2, CIE94::GraphicArts) . "\n"); echo('CIE94-Textiles:' . $color->getDifferenceCIE94($color2, CIE94::Textiles) . "\n"); echo('CMC-Acceptability:' . $color->getDifferenceCMC($color2, CMC::Acceptability) . "\n"); echo('CMC-Imperceptibility:' . $color->getDifferenceCMC($color2, CMC::Imperceptibility) . "\n"); echo('CIEDE2000:' . $color->getDifferenceCIEDE2000($color2) . "\n"); echo('Euclidean RGB:' . $color->getDifferenceEuclideanRGB($color2) . "\n"); echo('Euclidean Lab:' . $color->getDifferenceEuclideanLab($color2) . "\n"); echo('Weighted Euclidean RGB:' . $color->getDifferenceWeightedEuclideanRGB($color2) . "\n"); ``` CIE94 and CMC l:c accept an optional parameter adjusting the metric for the kind of quasimetric being evaluated. CIE94 offers an application type choice of either 'graphicArts' or 'textiles' for their eponymous use. CMC l:c offers a threshold choice of either 'acceptability' or 'imperceptibility' that nuances the just-noticeable difference between the colors. Reference White --------------- [](#reference-white) Use `referenceWhite` to specify Reference White for the Color class Support: - A; //Incandescent/tungsten - B; //Old direct sunlight at noon - C; //Old daylight - D50; //ICC profile PCS - D55; //Mid-morning daylight - D65; //Daylight, sRGB, Adobe-RGB - D75; //North sky daylight - E; //Equal energy - F1; //Daylight Fluorescent - F2; //Cool fluorescent - F3; //White Fluorescent - F4; //Warm White Fluorescent - F5; //Daylight Fluorescent - F6; //Lite White Fluorescent - F7; //Daylight fluorescent, D65 simulator - F8; //Sylvania F40, D50 simulator - F9; //Cool White Fluorescent - F10; //Ultralume 50, Philips TL85 - F11; //Ultralume 40, Philips TL84 - F12; //Ultralume 30, Philips TL83 ``` new Color(new RGB(255, 183, 255), referenceWhite: ReferenceWhite::D65); ``` RGB Working Space ----------------- [](#rgb-working-space) Use `RGBSpace` to specify RGB Working Space for the Color class Support: - Adobe RGB (1998) - AppleRGB - Best RGB - Beta RGB - Bruce RGB - CIE RGB - ColorMatch RGB - Don RGB 4 - ECI RGB - Ekta Space PS5 - NTSC RGB - PAL/SECAM RGB - ProPhoto RGB - SMPTE-C RGB - sRGB - Wide Gamut RGB ``` new Color(new RGB(255, 183, 255), RGBSpace: RGBSpace::sRGB_D65); ``` > In general, `RGB Working Space` needs to correspond to `Reference White`. The default is: ``` new Color(new RGB(255, 183, 255), referenceWhite: ReferenceWhite::D65, RGBSpace: RGBSpace::sRGB_D65); ``` ### Health Score 34 — LowBetter than 77% of packages Maintenance20 Infrequent updates — may be unmaintained Popularity31 Limited adoption so far Community10 Small or concentrated contributor base Maturity60 Established project with proven stability Bus Factor1 Top contributor holds 90% of commits — single point of failure How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window. **Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores. **Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement. **Maturity (30%)** — Project age, version count, PHP version support, and release stability. ### Release Activity Cadence Every ~0 days Total 3 Last Release 1584d ago ### Community Maintainers ![](https://www.gravatar.com/avatar/4d8c7cd0a79ae4a225651cbd75d83faa585f8e8d909322db9b52fd176949562f?d=identicon)[itwmw](/maintainers/itwmw) --- Top Contributors [![moniang](https://avatars.githubusercontent.com/u/61287199?v=4)](https://github.com/moniang "moniang (9 commits)")[![YepYuYu](https://avatars.githubusercontent.com/u/84311710?v=4)](https://github.com/YepYuYu "YepYuYu (1 commits)") --- Tags cie76cie94cmclccolor-differencedin99din99CIEDE2000cie76cie94color differenceCIE1976CIE1994CMCCMClcCIE2000CIE00Delta E ### Code Quality TestsPHPUnit Code StylePHP CS Fixer ### Embed Badge ![Health badge](/badges/itwmw-color-difference/health.svg) ``` [![Health](https://phpackages.com/badges/itwmw-color-difference/health.svg)](https://phpackages.com/packages/itwmw-color-difference) ``` ### Alternatives [fjw/color-compare A library for converting colors (Hex, RGB, HSL, CIELAB (LAB), DIN-99) and calculating color distances based on DIN-99. 1310.0k](/packages/fjw-color-compare)[components/modernizr Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user's browser. 10254.3k8](/packages/components-modernizr) PHPackages © 2026 [Directory](/)[Categories](/categories)[Trending](/trending)[Changelog](/changelog)[Analyze](/analyze)