Programming language: C#
License: MIT License
Tags: Image Processing    
Latest version: v3.0.0-beta1

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Colourful logo Colourful .NET

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Open source .NET library for working with color spaces.

The library is written in C# and released with an MIT license, so feel free to fork or use commercially.

Any feedback is appreciated, please visit the issues page or send me an e-mail.


Binaries of the last build can be downloaded on the AppVeyor CI page of the project.

The library is also published on NuGet.org, install using:

PM> Install-Package Colourful

Colourful is CLS Compliant (to allow use in VB.NET etc.) and is built for these target frameworks:

  • .NET 6
  • .NET Framework 4.5
  • .NET Standard 2.0
  • .NET Standard 1.1
  • For older .NET Framework 4.0 see version 1 of the library.


Example "hello world" usage that converts a color from sRGB to XYZ (keeping the D65 white point):

IColorConverter<RGBColor, XYZColor> converter = new ConverterBuilder()

RGBColor rgbColor = new RGBColor(1, 0, 0.5);
XYZColor xyzColor = converter.Convert(rgbColor); // XYZ [X=0.45, Y=0.23, Z=0.22]


Please see the docs pages below for various topics:

  • [Conversion between color spaces](docs/topic-conversion.md)
    • also handles chromatic adaptation with multiple possible LMS transformation matrices:
    • Bradford (default)
    • Von Kries (Hunt-Pointer-Estevez adjusted for D65)
    • Von Kries (Hunt-Pointer-Estevez for equal energy)
    • XYZ scaling
    • Spectral-sharpened Bradford
    • CMCCAT2000
    • CAT02
    • (user-defined chromatic adaptation matrix)
  • [Correlated color temperature (CCT)](docs/topic-cct.md)
    • Planckian locus approximation method
  • [Ranges of channel values and clamping](docs/topic-clamp.md)
  • [Computing color difference](docs/topic-color-difference.md)
    • multiple algorithms supported:
    • CIE Delta-E 1976
    • CMC l:c (1984)
    • CIE Delta-E 1994
    • CIE Delta-E 2000
    • JzCzhz Delta-Ez
    • Euclidean distance
  • [Cylindrical color spaces](docs/topic-cylindrical-spaces.md)
  • [Illuminants and white points](docs/topic-illuminants.md)
    • white points are handled correctly throughout the conversions
    • multiple illuminant are built-in:
    • A (Incandescent / Tungsten)
    • B (Direct sunlight at noon (obsolete))
    • C (Average / North sky Daylight (obsolete))
    • D50 (Horizon Light. ICC profile PCS)
    • D55 (Mid-morning / Mid-afternoon Daylight)
    • D65 (Noon Daylight: Television, sRGB color space)
    • D75 (North sky Daylight)
    • E (Equal energy)
    • F2 (Cool White Fluorescent)
    • F7 (D65 simulator, Daylight simulator)
    • F11 (Philips TL84, Ultralume 40)
    • (user-defined white points)
  • [Macbeth ColorChecker chart](docs/topic-macbeth-color-checker.md)
  • [Changes between v2 and v3](docs/topic-changes-v2-v3.md)

For information about specific color spaces, see the following docs pages:

  • [RGB color spaces](docs/spaces-rgb.md)
    • support for both ordinary RGB and linear RGB
    • multiple working spaces supported:
    • sRGB
    • Simplified sRGB
    • ECI RGB v2
    • Adobe RGB (1998)
    • Apple sRGB
    • Best RGB
    • Beta RGB
    • Bruce RGB
    • CIE RGB
    • ColorMatch RGB
    • Don RGB 4
    • Ekta Space PS5
    • NTSC RGB
    • ProPhoto RGB
    • Wide Gamut RGB
    • Rec. 709 (ITU-R Recommendation BT.709 – HDTV)
    • Rec. 2020 (ITU-R Recommendation BT.2020 – UHDTV)
    • (user-defined RGB working spaces)
  • [Lab color spaces](docs/spaces-lab.md)
    • CIE L*a*b* (1976) (CIELAB)
    • CIE L*C*h°ab (CIELCH)
    • Hunter Lab
  • [Luv color spaces](docs/spaces-luv.md)
    • CIE L*u*v* (1976) (CIELUV)
    • CIE L*C*h°uv (CIELCH)
  • [XYZ color space](docs/spaces-xyz.md)
    • CIE XYZ (1931)
    • CIE xyY (derived from XYZ)
  • [Jzazbz color spaces](docs/spaces-jzazbz.md)
    • Jzazbz (Safdar & al., 2017)
    • JzCzhz (polar of Jzazbz)
  • [LMS color space](docs/spaces-lms.md)
  • [xy chromaticity](docs/spaces-xy.md)

*Note that all licence references and agreements mentioned in the Colourful README section above are relevant to that project's source code only.