ColorUtils

public static @ColorInt int HSLToColor(@NonNull float[] hsl)

Convert HSL (hue-saturation-lightness) components to a RGB color.

• hsl[0] is Hue [0, 360)
• hsl[1] is Saturation [0, 1]
• hsl[2] is Lightness [0, 1]

public static @ColorInt int LABToColor(
    @FloatRange(from = 0.0, to = 100) double l,
    @FloatRange(from = "-128", to = 127) double a,
    @FloatRange(from = "-128", to = 127) double b
)

Converts a color from CIE Lab to its RGB representation.

public static void LABToXYZ(
    @FloatRange(from = 0.0, to = 100) double l,
    @FloatRange(from = "-128", to = 127) double a,
    @FloatRange(from = "-128", to = 127) double b,
    @NonNull double[] outXyz
)

Converts a color from CIE Lab to CIE XYZ representation.

The resulting XYZ representation will use the D65 illuminant and the CIE 2° Standard Observer (1931).

• outXyz[0] is X [0, 95.047)
• outXyz[1] is Y [0, 100)
• outXyz[2] is Z [0, 108.883)

public static @ColorInt int M3HCTToColor(
    @FloatRange(from = 0.0, to = 360, toInclusive = false) float hue,
    @FloatRange(from = 0.0, to = Double.POSITIVE_INFINITY, toInclusive = false) float chroma,
    @FloatRange(from = 0.0, to = 100) float tone
)

Generate an ARGB color using M3HCT color parameters. HCT color space is a new color space proposed in Material Design 3

public static void RGBToHSL(
    @IntRange(from = 0, to = 255) int r,
    @IntRange(from = 0, to = 255) int g,
    @IntRange(from = 0, to = 255) int b,
    @NonNull float[] outHsl
)

Convert RGB components to HSL (hue-saturation-lightness).

• outHsl[0] is Hue [0, 360)
• outHsl[1] is Saturation [0, 1]
• outHsl[2] is Lightness [0, 1]

public static void RGBToLAB(
    @IntRange(from = 0, to = 255) int r,
    @IntRange(from = 0, to = 255) int g,
    @IntRange(from = 0, to = 255) int b,
    @NonNull double[] outLab
)

Convert RGB components to its CIE Lab representative components.

• outLab[0] is L [0, 100]
• outLab[1] is a [-128, 127)
• outLab[2] is b [-128, 127)

public static void RGBToXYZ(
    @IntRange(from = 0, to = 255) int r,
    @IntRange(from = 0, to = 255) int g,
    @IntRange(from = 0, to = 255) int b,
    @NonNull double[] outXyz
)

Convert RGB components to its CIE XYZ representative components.

The resulting XYZ representation will use the D65 illuminant and the CIE 2° Standard Observer (1931).

• outXyz[0] is X [0, 95.047)
• outXyz[1] is Y [0, 100)
• outXyz[2] is Z [0, 108.883)

public static @ColorInt int XYZToColor(
    @FloatRange(from = 0.0, to = 95.047) double x,
    @FloatRange(from = 0.0, to = 100.0) double y,
    @FloatRange(from = 0.0, to = 108.883) double z
)

Converts a color from CIE XYZ to its RGB representation.

This method expects the XYZ representation to use the D65 illuminant and the CIE 2° Standard Observer (1931).

public static void XYZToLAB(
    @FloatRange(from = 0.0, to = 95.047) double x,
    @FloatRange(from = 0.0, to = 100.0) double y,
    @FloatRange(from = 0.0, to = 108.883) double z,
    @NonNull double[] outLab
)

Converts a color from CIE XYZ to CIE Lab representation.

This method expects the XYZ representation to use the D65 illuminant and the CIE 2° Standard Observer (1931).

• outLab[0] is L [0, 100]
• outLab[1] is a [-128, 127)
• outLab[2] is b [-128, 127)

public static @ColorInt int blendARGB(
    @ColorInt int color1,
    @ColorInt int color2,
    @FloatRange(from = 0.0, to = 1.0) float ratio
)

Blend between two ARGB colors using the given ratio.

A blend ratio of 0.0 will result in color1, 0.5 will give an even blend, 1.0 will result in color2.

public static void blendHSL(
    @NonNull float[] hsl1,
    @NonNull float[] hsl2,
    @FloatRange(from = 0.0, to = 1.0) float ratio,
    @NonNull float[] outResult
)

Blend between hsl1 and hsl2 using the given ratio. This will interpolate the hue using the shortest angle.

A blend ratio of 0.0 will result in hsl1, 0.5 will give an even blend, 1.0 will result in hsl2.

public static void blendLAB(
    @NonNull double[] lab1,
    @NonNull double[] lab2,
    @FloatRange(from = 0.0, to = 1.0) double ratio,
    @NonNull double[] outResult
)

Blend between two CIE-LAB colors using the given ratio.

A blend ratio of 0.0 will result in lab1, 0.5 will give an even blend, 1.0 will result in lab2.

public static double calculateContrast(@ColorInt int foreground, @ColorInt int background)

Returns the contrast ratio between foreground and background. background must be opaque.

Formula defined here.

public static @FloatRange(from = 0.0, to = 1.0) double calculateLuminance(@ColorInt int color)

Returns the luminance of a color as a float between 0.0 and 1.0.

Defined as the Y component in the XYZ representation of color.

public static int calculateMinimumAlpha(
    @ColorInt int foreground,
    @ColorInt int background,
    float minContrastRatio
)

Calculates the minimum alpha value which can be applied to foreground so that would have a contrast value of at least minContrastRatio when compared to background.

public static void colorToHSL(@ColorInt int color, @NonNull float[] outHsl)

Convert the ARGB color to its HSL (hue-saturation-lightness) components.

• outHsl[0] is Hue [0, 360)
• outHsl[1] is Saturation [0, 1]
• outHsl[2] is Lightness [0, 1]

public static void colorToLAB(@ColorInt int color, @NonNull double[] outLab)

Convert the ARGB color to its CIE Lab representative components.

public static void colorToM3HCT(@ColorInt int color, @Size(value = 3) @NonNull float[] outM3HCT)

Generate a M3HCT color from an ARGB color. HCT color space is a new color space proposed in Material Design 3

public static void colorToXYZ(@ColorInt int color, @NonNull double[] outXyz)

Convert the ARGB color to its CIE XYZ representative components.

The resulting XYZ representation will use the D65 illuminant and the CIE 2° Standard Observer (1931).

• outXyz[0] is X [0, 95.047)
• outXyz[1] is Y [0, 100)
• outXyz[2] is Z [0, 108.883)

@RequiresApi(value = 26)
public static @NonNull Color compositeColors(@NonNull Color foreground, @NonNull Color background)

Composites two translucent colors together. More specifically, adds two colors using the source over blending mode. The colors must not be pre-multiplied and the result is a non pre-multiplied color.

If the two colors have different color spaces, the foreground color is converted to the color space of the background color.

The following example creates a purple color by blending opaque blue with semi-translucent red:

Color purple = ColorUtils.compositeColors(
        Color.valueOf(1f, 0f, 0f, 0.5f),
        Color.valueOf(0f, 0f, 1f));

public static int compositeColors(@ColorInt int foreground, @ColorInt int background)

Composite two potentially translucent colors over each other and returns the result.

public static double distanceEuclidean(@NonNull double[] labX, @NonNull double[] labY)

Returns the euclidean distance between two LAB colors.

public static @ColorInt int setAlphaComponent(@ColorInt int color, @IntRange(from = 0, to = 255) int alpha)

Set the alpha component of color to be alpha.