ICC_ProfileRGBpublic 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.
- The profile includes the
redColorantTag,
greenColorantTag, blueColorantTag,
redTRCTag, greenTRCTag,
blueTRCTag, and mediaWhitePointTag tags.
The ICC_Profile getInstance method will
return an ICC_ProfileRGB object when these conditions are met.
Three-component, matrix-based input profiles and RGB display profiles are
examples of this type of profile.
This profile class 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 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.
|
| Fields Summary |
|---|
| public static final int | REDCOMPONENTUsed to get a gamma value or TRC for the red component. | | public static final int | GREENCOMPONENTUsed to get a gamma value or TRC for the green component. | | public static final int | BLUECOMPONENTUsed to get a gamma value or TRC for the blue component. |
| Constructors Summary |
|---|
ICC_ProfileRGB(long ID)Constructs an new ICC_ProfileRGB from a CMM ID.
super(ID);
| ICC_ProfileRGB(sun.awt.color.ProfileDeferralInfo pdi)Constructs a new ICC_ProfileRGB from a
ProfileDeferralInfo object.
super(pdi);
|
| Methods Summary |
|---|
| 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 {@link #getTRC(int)} method.
When using a gamma value,
the linear component (R, G, or B) is computed as follows:
gamma
linearComponent = deviceComponent
float theGamma;
int theSignature;
switch (component) {
case REDCOMPONENT:
theSignature = ICC_Profile.icSigRedTRCTag;
break;
case GREENCOMPONENT:
theSignature = ICC_Profile.icSigGreenTRCTag;
break;
case BLUECOMPONENT:
theSignature = ICC_Profile.icSigBlueTRCTag;
break;
default:
throw new IllegalArgumentException("Must be Red, Green, or Blue");
}
theGamma = super.getGamma(theSignature);
return theGamma;
| | 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.
float[][] theMatrix = new float[3][3];
float[] tmpMatrix;
tmpMatrix = getXYZTag(ICC_Profile.icSigRedColorantTag);
theMatrix[0][0] = tmpMatrix[0];
theMatrix[1][0] = tmpMatrix[1];
theMatrix[2][0] = tmpMatrix[2];
tmpMatrix = getXYZTag(ICC_Profile.icSigGreenColorantTag);
theMatrix[0][1] = tmpMatrix[0];
theMatrix[1][1] = tmpMatrix[1];
theMatrix[2][1] = tmpMatrix[2];
tmpMatrix = getXYZTag(ICC_Profile.icSigBlueColorantTag);
theMatrix[0][2] = tmpMatrix[0];
theMatrix[1][2] = tmpMatrix[1];
theMatrix[2][2] = tmpMatrix[2];
return theMatrix;
| | public float[] | getMediaWhitePoint()Returns an array that contains the components of the profile's
mediaWhitePointTag.
return super.getMediaWhitePoint();
| | 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 {@link #getGamma(int)}
method should be used to get the gamma value.
short[] theTRC;
int theSignature;
switch (component) {
case REDCOMPONENT:
theSignature = ICC_Profile.icSigRedTRCTag;
break;
case GREENCOMPONENT:
theSignature = ICC_Profile.icSigGreenTRCTag;
break;
case BLUECOMPONENT:
theSignature = ICC_Profile.icSigBlueTRCTag;
break;
default:
throw new IllegalArgumentException("Must be Red, Green, or Blue");
}
theTRC = super.getTRC(theSignature);
return theTRC;
|
|
