Package icyllis.arc3d.core

Enum Class ColorSpace.Adaptation

java.lang.Object
java.lang.Enum<ColorSpace.Adaptation>
icyllis.arc3d.core.ColorSpace.Adaptation
All Implemented Interfaces:
Serializable, Comparable<ColorSpace.Adaptation>, Constable
Enclosing class:
ColorSpace
public static enum ColorSpace.Adaptation extends Enum<ColorSpace.Adaptation>

List of adaptation matrices that can be used for chromatic adaptation using the von Kries transform. These matrices are used to convert values in the CIE XYZ space to values in the LMS space (Long Medium Short).

Given an adaptation matrix \(A\), the conversion from XYZ to LMS is straightforward:

$$\left[ \begin{array}{c} L\\ M\\ S \end{array} \right] = A \left[ \begin{array}{c} X\\ Y\\ Z \end{array} \right]$$

The complete von Kries transform \(T\) uses a diagonal matrix noted \(D\) to perform the adaptation in LMS space. In addition to \(A\) and \(D\), the source white point \(W1\) and the destination white point \(W2\) must be specified:

$$\begin{align*} \left[ \begin{array}{c} L_1\\ M_1\\ S_1 \end{array} \right] invalid input: '&'= A \left[ \begin{array}{c} W1_X\\ W1_Y\\ W1_Z \end{array} \right] \\\ \left[ \begin{array}{c} L_2\\ M_2\\ S_2 \end{array} \right] invalid input: '&'= A \left[ \begin{array}{c} W2_X\\ W2_Y\\ W2_Z \end{array} \right] \\\ D invalid input: '&'= \left[ \begin{matrix} \frac{L_2}{L_1} invalid input: '&' 0 invalid input: '&' 0 \\\ 0 invalid input: '&' \frac{M_2}{M_1} invalid input: '&' 0 \\\ 0 invalid input: '&' 0 invalid input: '&' \frac{S_2}{S_1} \end{matrix} \right] \\\ T invalid input: '&'= A^{-1}.D.A \end{align*}$$

As an example, the resulting matrix \(T\) can then be used to perform the chromatic adaptation of sRGB XYZ transform from D65 to D50:

$$sRGB_{D50} = T.sRGB_{D65}$$

See Also:

  • Enum Constant Details

    • BRADFORD

      public static final ColorSpace.Adaptation BRADFORD
      Bradford chromatic adaptation transform, as defined in the CIECAM97s color appearance model.

    • VON_KRIES

      public static final ColorSpace.Adaptation VON_KRIES
      von Kries chromatic adaptation transform.

    • CIECAT02

      public static final ColorSpace.Adaptation CIECAT02
      CIECAT02 chromatic adaption transform, as defined in the CIECAM02 color appearance model.

  • Method Details

    • values

      public static ColorSpace.Adaptation[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static ColorSpace.Adaptation valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum class has no constant with the specified name
      NullPointerException - if the argument is null