# Class ICC_ProfileRGB

java.lang.Object
java.awt.color.ICC_Profile
java.awt.color.ICC_ProfileRGB

All Implemented Interfaces:
  `Serializable`

public final class ICC_ProfileRGB extends ICC_Profile
The `ICC_ProfileRGB` class is a subclass of the `ICC_Profile` class that represents profiles which meet the following criteria: the profile's color space type is RGB, and the profile includes the `redColorantTag`, `greenColorantTag`, `blueColorantTag`, `redTRCTag`, `greenTRCTag`, `blueTRCTag`, `mediaWhitePointTag` tags. The `getInstance` methods in the `ICC_Profile` class will return an `ICC_ProfileRGB` object when the above conditions are met. Three-component, matrix-based input profiles and RGB display profiles are examples of this type of profile.

The advantage of this class is that it provides color transform matrices and lookup tables that Java or native methods can use directly to optimize color conversion in some cases.

To transform from a device profile color space to the CIEXYZ Profile Connection Space, each device color component is first linearized by a lookup through the corresponding tone reproduction curve (TRC). The resulting linear RGB components are converted to the CIEXYZ PCS using a 3x3 matrix constructed from the RGB colorants.

                     linearR = redTRC[deviceR]

                     linearG = greenTRC[deviceG]

                     linearB = blueTRC[deviceB]

       _      _       _                                             _   _         _
      [  PCSX  ]     [  redColorantX  greenColorantX  blueColorantX  ] [  linearR  ]
      [        ]     [                                               ] [           ]
      [  PCSY  ]  =  [  redColorantY  greenColorantY  blueColorantY  ] [  linearG  ]
      [        ]     [                                               ] [           ]
      [_ PCSZ _]     [_ redColorantZ  greenColorantZ  blueColorantZ _] [_ linearB _]

The inverse transform is performed by converting PCS XYZ components to linear RGB components through the inverse of the above 3x3 matrix, and then converting linear RGB to device RGB through inverses of the TRCs.

See Also:
  - Serialized Form

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final int`
  `BLUECOMPONENT`
  Used to get a gamma value or TRC for the blue component.
  `static final int`
  `GREENCOMPONENT`
  Used to get a gamma value or TRC for the green component.
  `static final int`
  `REDCOMPONENT`
  Used to get a gamma value or TRC for the red component.

  ### Fields declared in class java.awt.color.ICC_Profile

  `CLASS_ABSTRACT, CLASS_COLORSPACECONVERSION, CLASS_DEVICELINK, CLASS_DISPLAY, CLASS_INPUT, CLASS_NAMEDCOLOR, CLASS_OUTPUT, icAbsoluteColorimetric, icCurveCount, icCurveData, icHdrAttributes, icHdrCmmId, icHdrColorSpace, icHdrCreator, icHdrDate, icHdrDeviceClass, icHdrFlags, icHdrIlluminant, icHdrMagic, icHdrManufacturer, icHdrModel, icHdrPcs, icHdrPlatform, icHdrProfileID, icHdrRenderingIntent, icHdrSize, icHdrVersion, icICCAbsoluteColorimetric, icMediaRelativeColorimetric, icPerceptual, icRelativeColorimetric, icSaturation, icSigAbstractClass, icSigAToB0Tag, icSigAToB1Tag, icSigAToB2Tag, icSigBlueColorantTag, icSigBlueMatrixColumnTag, icSigBlueTRCTag, icSigBToA0Tag, icSigBToA1Tag, icSigBToA2Tag, icSigCalibrationDateTimeTag, icSigCharTargetTag, icSigChromaticAdaptationTag, icSigChromaticityTag, icSigCmyData, icSigCmykData, icSigColorantOrderTag, icSigColorantTableTag, icSigColorSpaceClass, icSigCopyrightTag, icSigCrdInfoTag, icSigDeviceMfgDescTag, icSigDeviceModelDescTag, icSigDeviceSettingsTag, icSigDisplayClass, icSigGamutTag, icSigGrayData, icSigGrayTRCTag, icSigGreenColorantTag, icSigGreenMatrixColumnTag, icSigGreenTRCTag, icSigHead, icSigHlsData, icSigHsvData, icSigInputClass, icSigLabData, icSigLinkClass, icSigLuminanceTag, icSigLuvData, icSigMeasurementTag, icSigMediaBlackPointTag, icSigMediaWhitePointTag, icSigNamedColor2Tag, icSigNamedColorClass, icSigOutputClass, icSigOutputResponseTag, icSigPreview0Tag, icSigPreview1Tag, icSigPreview2Tag, icSigProfileDescriptionTag, icSigProfileSequenceDescTag, icSigPs2CRD0Tag, icSigPs2CRD1Tag, icSigPs2CRD2Tag, icSigPs2CRD3Tag, icSigPs2CSATag, icSigPs2RenderingIntentTag, icSigRedColorantTag, icSigRedMatrixColumnTag, icSigRedTRCTag, icSigRgbData, icSigScreeningDescTag, icSigScreeningTag, icSigSpace2CLR, icSigSpace3CLR, icSigSpace4CLR, icSigSpace5CLR, icSigSpace6CLR, icSigSpace7CLR, icSigSpace8CLR, icSigSpace9CLR, icSigSpaceACLR, icSigSpaceBCLR, icSigSpaceCCLR, icSigSpaceDCLR, icSigSpaceECLR, icSigSpaceFCLR, icSigTechnologyTag, icSigUcrBgTag, icSigViewingCondDescTag, icSigViewingConditionsTag, icSigXYZData, icSigYCbCrData, icSigYxyData, icTagReserved, icTagType, icXYZNumberX`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `float`
  `getGamma(int component)`
  Returns a gamma value representing the tone reproduction curve (TRC) for a particular component.
  `float[][]`
  `getMatrix()`
  Returns a 3x3 `float` matrix constructed from the X, Y, and Z components of the profile's `redColorantTag`, `greenColorantTag`, and `blueColorantTag`.
  `float[]`
  `getMediaWhitePoint()`
  Returns an array that contains the components of the profile's `mediaWhitePointTag`.
  `short[]`
  `getTRC(int component)`
  Returns the TRC for a particular component as an array.

  ### Methods declared in class java.awt.color.ICC_Profile

  `getColorSpaceType, getData, getData, getInstance, getInstance, getInstance, getInstance, getMajorVersion, getMinorVersion, getNumComponents, getPCSType, getProfileClass, readResolve, setData, write, write`

  ### Methods declared in class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### REDCOMPONENT

    public static final int REDCOMPONENT
    Used to get a gamma value or TRC for the red component.
    See Also:
      - Constant Field Values

  - ### GREENCOMPONENT

    public static final int GREENCOMPONENT
    Used to get a gamma value or TRC for the green component.
    See Also:
      - Constant Field Values

  - ### BLUECOMPONENT

    public static final int BLUECOMPONENT
    Used to get a gamma value or TRC for the blue component.
    See Also:
      - Constant Field Values

- ## Method Details

  - ### getMediaWhitePoint

    public float[] getMediaWhitePoint()
    Returns an array that contains the components of the profile's `mediaWhitePointTag`.
    Returns:
      a 3-element `float` array containing the x, y, and z components of the profile's `mediaWhitePointTag`

  - ### getMatrix

    public float[][] getMatrix()
    Returns a 3x3 `float` matrix constructed from the X, Y, and Z components of the profile's `redColorantTag`, `greenColorantTag`, and `blueColorantTag`.

    This matrix can be used for color transforms in the forward direction of the profile--from the profile color space to the CIEXYZ PCS.

    Returns:
      a 3x3 `float` array that contains the x, y, and z components of the profile's `redColorantTag`, `greenColorantTag`, and `blueColorantTag`

  - ### getGamma

    public float getGamma(int component)
    Returns a gamma value representing the tone reproduction curve (TRC) for a particular component. The component parameter must be one of `REDCOMPONENT`, `GREENCOMPONENT`, or `BLUECOMPONENT`.

    If the profile represents the TRC for the corresponding component as a table rather than a single gamma value, an exception is thrown. In this case the actual table can be obtained through the `getTRC(int)` method. When using a gamma value, the linear component (R, G, or B) is computed as follows:

                                                   gamma
                  linearComponent = deviceComponent

    Parameters:
      `component` - the `ICC_ProfileRGB` constant that represents the component whose TRC you want to retrieve
    Returns:
      the gamma value as a float
    Throws:
      `IllegalArgumentException` - if the component is not `REDCOMPONENT`, `GREENCOMPONENT`, or `BLUECOMPONENT`
      `ProfileDataException` - if the profile does not specify the corresponding TRC as a single gamma value

  - ### getTRC

    public short[] getTRC(int component)
    Returns the TRC for a particular component as an array. Component must be `REDCOMPONENT`, `GREENCOMPONENT`, or `BLUECOMPONENT`. Otherwise the returned array represents a lookup table where the input component value is conceptually in the range [0.0, 1.0]. Value 0.0 maps to array index 0 and value 1.0 maps to array index `length-1`. Interpolation might be used to generate output values for input values that do not map exactly to an index in the array. Output values also map linearly to the range [0.0, 1.0]. Value 0.0 is represented by an array value of 0x0000 and value 1.0 by 0xFFFF. In other words, the values are really unsigned `short` values even though they are returned in a `short` array.

    If the profile has specified the corresponding TRC as linear (gamma = 1.0) or as a simple gamma value, this method throws an exception. In this case, the `getGamma(int)` method should be used to get the gamma value.

    Parameters:
      `component` - the `ICC_ProfileRGB` constant that represents the component whose TRC you want to retrieve: `REDCOMPONENT`, `GREENCOMPONENT`, or `BLUECOMPONENT`
    Returns:
      a short array representing the TRC
    Throws:
      `IllegalArgumentException` - if the component is not `REDCOMPONENT`, `GREENCOMPONENT`, or `BLUECOMPONENT`
      `ProfileDataException` - if the profile does not specify the corresponding TRC as a table