colors

Strongly-typed immutable color-models and utility conversion functions in Java. The code is based on the formulae as described on the respective Wikipedia articles and other sites that host details on color models. References to the same are mentioned at various places all over the code.

CSS3 colors are also available in RGB format using the CSS3Colors class. Usage is as simple as: CMY cmy = CSS3Colors.ORANGE.cmy();. Detailed examples are available below.

Usage examples

// from RGB to HSL model, in float[] array
float[] hsl = new RGB("#a4b52f").invert().hsl().asArray();

// various ways to create colors
CMY cmy = new RGB("#abc").cmy();
CMYK cmyk = new RGB(29, 39, 49).cmyk();

// using color names
CMY cmy = CSS3Colors.ORANGE.cmy();

// multiple conversions
HSL = new HSB(0.3f, 0.3f, 0.3f).rgb().hsi().rgb().hsl();

// all models in a single chain
RGB rgb = new RGB(new int[] { 29, 39, 49})              // obtain the RGB color
		    .hsb() .                            // let's convert it to HSB
		    .rgb().hsi()                        // now over to HSI
		    .rgb().hsl()                        // over to HSL
		    .rgb().xyz()                        // to XYZ
		    .hunterLAB()                        // to HunterLAB
		    .xyz().yxy()                        // to Yxy
		    .xyz().rgb()                        // and back to RGB

Available Color Models

• CMY - Cyan, Magenta, Yellow
• CMYK - Cyan, Magenta, Yellow, Black
• HSB - Hue, Saturation, Brightness
• HSI - Hue, Saturation, Intensity
• HSL - Hue, Saturation, Luminosity
• HunterLAB
• LAB
• LCH - Lightness, Chroma, Hue
• LUV
• RGB - Red, Green, Blue
• RGBA - Red, Green, Blue, Alpha
• XYZ - CIE 1931 XYZ color space including following Illuminants: A, C, D50, D55, D65, D75, F2, F7, F11
• YIQ
• YUV
• Yxy

Available Conversions

• CMY <> RGB
• CMYK <> RGB
• HSB <> RGB
• HSI <> RGB
• HSL <> RGB
• HunterLAB <> XYZ
• LAB <> XYZ
• LCH <> LAB
• LUV <> XYZ
• RGB
• RGBA
• XYZ <> RGB
• YIQ <> RGB
• YUV <> RGB
• Yxy <> XYZ

RoadMap

• Add YCbCr family of color models - https://en.wikipedia.org/wiki/YCbCr
• Unit-test cases for conversions

Versioning

For transparency and insight into our release cycle, and for striving to maintain backward compatibility, this project will be maintained under the Semantic Versioning guidelines as much as possible.

Releases will be numbered with the follow format:

<major>.<minor>.<patch>

And constructed with the following guidelines:

• Breaking backward compatibility bumps the major
• New additions without breaking backward compatibility bumps the minor
• Bug fixes and misc changes bump the patch

For more information on SemVer, please visit http://semver.org/.

References

• http://colormine.org/colors-by-name
• https://en.wikipedia.org/wiki/CIE_1931_color_space
• https://en.wikipedia.org/wiki/Lab_color_space
• http://www.easyrgb.com/index.php?X=MATH&H=16
• https://en.wikipedia.org/wiki/Color_temperature

License

colors - Strongly typed immutable color models
Copyright (c) 2017, Sandeep Gupta

https://sangupta.com/projects/colors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.