/*
* Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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/**********************************************************************
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*** COPYRIGHT (c) Eastman Kodak Company, 1997 ***
*** As an unpublished work pursuant to Title 17 of the United ***
*** States Code. All rights reserved. ***
**********************************************************************
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**********************************************************************/
package java.awt.color;
import sun.java2d.cmm.Profile;
import sun.java2d.cmm.ProfileDeferralInfo;
/**
*
* A subclass of the ICC_Profile class which represents profiles
* which meet the following criteria: the color space type of the
* profile is TYPE_GRAY and the profile includes the grayTRCTag and
* mediaWhitePointTag tags. Examples of this kind of profile are
* monochrome input profiles, monochrome display profiles, and
* monochrome output profiles. The getInstance methods in the
* ICC_Profile class will
* return an ICC_ProfileGray object when the above conditions are
* met. The advantage of this class is that it provides a lookup
* table that Java or native methods may be able to use directly to
* optimize color conversion in some cases.
* <p>
* To transform from a GRAY device profile color space to the CIEXYZ Profile
* Connection Space, the device gray component is transformed by
* a lookup through the tone reproduction curve (TRC). The result is
* treated as the achromatic component of the PCS.
<pre>
PCSY = grayTRC[deviceGray]
</pre>
* The inverse transform is done by converting the PCS Y components to
* device Gray via the inverse of the grayTRC.
* <p>
*/
public class ICC_ProfileGray
extends ICC_Profile {
static final long serialVersionUID = -1124721290732002649L;
/**
* Constructs a new ICC_ProfileGray from a CMM ID.
*/
ICC_ProfileGray(Profile p) {
super(p);
}
/**
* Constructs a new ICC_ProfileGray from a ProfileDeferralInfo object.
*/
ICC_ProfileGray(ProfileDeferralInfo pdi) {
super(pdi);
}
/**
* Returns a float array of length 3 containing the X, Y, and Z
* components of the mediaWhitePointTag in the ICC profile.
* @return an array containing the components of the
* mediaWhitePointTag in the ICC profile.
*/
public float[] getMediaWhitePoint() {
return super.getMediaWhitePoint();
}
/**
* Returns a gamma value representing the tone reproduction
* curve (TRC). If the profile represents the TRC as a table rather
* than a single gamma value, then an exception is thrown. In this
* case the actual table can be obtained via getTRC(). When
* using a gamma value, the PCS Y component is computed as follows:
<pre>
gamma
PCSY = deviceGray
</pre>
* @return the gamma value as a float.
* @exception ProfileDataException if the profile does not specify
* the TRC as a single gamma value.
*/
public float getGamma() {
float theGamma;
theGamma = super.getGamma(ICC_Profile.icSigGrayTRCTag);
return theGamma;
}
/**
* Returns the TRC as an array of shorts. If the profile has
* specified the TRC as linear (gamma = 1.0) or as a simple gamma
* value, this method throws an exception, and the getGamma() method
* should be used to get the gamma value. Otherwise the short array
* returned here represents a lookup table where the input Gray 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 may be used to generate output values for
* input values which 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, i.e. the values are really unsigned
* short values, although they are returned in a short array.
* @return a short array representing the TRC.
* @exception ProfileDataException if the profile does not specify
* the TRC as a table.
*/
public short[] getTRC() {
short[] theTRC;
theTRC = super.getTRC(ICC_Profile.icSigGrayTRCTag);
return theTRC;
}
}