This library lets you perform colorspace convertions, create new colorspaces and much more.
I would like to really thank:
- the Android documentation from which the architecture of the library is highly inspired.
- Bruce Justin Lindbloom for his awesome website where you can find all kinds of formulas.
Without them this project wouldn't have been possible.
In their current state APIs are not quite stable, so It can be possible that the following code snippets are wrong.
// extend Rgb class
class Srgb extends Rgb {
public Srgb() {
super(
"sRGB IEC61966-2.1", // name of the colorspace
Primaries.BT709, // primaries coordinates (red x, red y, green x, green y, blue x, blue y)
Illuminant.D65, // white point
// opto-electrical transfer function (oetf)
d -> {
if (d < 0.0031308)
return 12.92 * d;
else
return 1.055 * Math.pow(d, 1 / 2.4) - 0.055;
},
// electro-optical transfer function (eotf)
d -> {
if (d < 0.04045)
return d / 12.92;
else
return Math.pow(((d 0.055) / 1.055), 2.4);
}
);
}
}There are lots of constructors to simplify colorspace creation. For example:
- you can define a gamma value used for all the three channels
- you can define a specific gamma value for each individual channel.
- you can define a OETF/EOTF function used for all the three channels
- you can define a OETF/EOTF function for each individual channel.
To create a non-RGB colorspace you must extend ColorSpace class.
// creates a connector between two color spaces
Connector connector = ColorSpaces.CIE_LAB.connect(ColorSpaces.SRGB);
// define a color in CIELab colorspace
FloatArray lab = new FloatArray(0, 0, 0);
// perform the conversion from CIELab to sRGB
FloatArray rgb = connector.transform(lab);// calculate deltaE between two colors of the same colorspace
FloatArray color1 = new FloatArray(0, 0, 0);
FloatArray color2 = new FloatArray(1, 1, 1);
float deltaE = ColorSpaceUtils.deltaE(ColorSpace.SRGB, color1, color2);
// calculate deltaE between two colors of different colorspaces
FloatArray color1 = new FloatArray(0, 0, 0);
FloatArray color2 = new FloatArray(1, 1, 1);
float deltaE = ColorSpaceUtils.deltaE(ColorSpace.SRGB, color1, ColorSpace.DCI_P3, color2);