1/*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26/*
27 **********************************************************************
28 **********************************************************************
29 **********************************************************************
30 *** COPYRIGHT (c) Eastman Kodak Company, 1997                      ***
31 *** As  an unpublished  work pursuant to Title 17 of the United    ***
32 *** States Code.  All rights reserved.                             ***
33 **********************************************************************
34 **********************************************************************
35 **********************************************************************/
36
37package java.awt.color;
38
39import sun.java2d.cmm.Profile;
40import sun.java2d.cmm.ProfileDeferralInfo;
41
42/**
43 *
44 * A subclass of the ICC_Profile class which represents profiles
45 * which meet the following criteria: the color space type of the
46 * profile is TYPE_GRAY and the profile includes the grayTRCTag and
47 * mediaWhitePointTag tags.  Examples of this kind of profile are
48 * monochrome input profiles, monochrome display profiles, and
49 * monochrome output profiles.  The getInstance methods in the
50 * ICC_Profile class will
51 * return an ICC_ProfileGray object when the above conditions are
52 * met.  The advantage of this class is that it provides a lookup
53 * table that Java or native methods may be able to use directly to
54 * optimize color conversion in some cases.
55 * <p>
56 * To transform from a GRAY device profile color space to the CIEXYZ Profile
57 * Connection Space, the device gray component is transformed by
58 * a lookup through the tone reproduction curve (TRC).  The result is
59 * treated as the achromatic component of the PCS.
60<pre>
61
62&nbsp;               PCSY = grayTRC[deviceGray]
63
64</pre>
65 * The inverse transform is done by converting the PCS Y components to
66 * device Gray via the inverse of the grayTRC.
67 */
68
69
70
71public class ICC_ProfileGray
72extends ICC_Profile {
73
74    static final long serialVersionUID = -1124721290732002649L;
75
76    /**
77     * Constructs a new ICC_ProfileGray from a CMM ID.
78     */
79    ICC_ProfileGray(Profile p) {
80        super(p);
81    }
82
83    /**
84     * Constructs a new ICC_ProfileGray from a ProfileDeferralInfo object.
85     */
86    ICC_ProfileGray(ProfileDeferralInfo pdi) {
87        super(pdi);
88    }
89
90
91    /**
92     * Returns a float array of length 3 containing the X, Y, and Z
93     * components of the mediaWhitePointTag in the ICC profile.
94     * @return an array containing the components of the
95     * mediaWhitePointTag in the ICC profile.
96     */
97    public float[] getMediaWhitePoint() {
98        return super.getMediaWhitePoint();
99    }
100
101
102    /**
103     * Returns a gamma value representing the tone reproduction
104     * curve (TRC).  If the profile represents the TRC as a table rather
105     * than a single gamma value, then an exception is thrown.  In this
106     * case the actual table can be obtained via getTRC().  When
107     * using a gamma value, the PCS Y component is computed as follows:
108<pre>
109
110&nbsp;                         gamma
111&nbsp;        PCSY = deviceGray
112
113</pre>
114     * @return the gamma value as a float.
115     * @exception ProfileDataException if the profile does not specify
116     *            the TRC as a single gamma value.
117     */
118    public float getGamma() {
119    float theGamma;
120
121        theGamma = super.getGamma(ICC_Profile.icSigGrayTRCTag);
122        return theGamma;
123    }
124
125    /**
126     * Returns the TRC as an array of shorts.  If the profile has
127     * specified the TRC as linear (gamma = 1.0) or as a simple gamma
128     * value, this method throws an exception, and the getGamma() method
129     * should be used to get the gamma value.  Otherwise the short array
130     * returned here represents a lookup table where the input Gray value
131     * is conceptually in the range [0.0, 1.0].  Value 0.0 maps
132     * to array index 0 and value 1.0 maps to array index length-1.
133     * Interpolation may be used to generate output values for
134     * input values which do not map exactly to an index in the
135     * array.  Output values also map linearly to the range [0.0, 1.0].
136     * Value 0.0 is represented by an array value of 0x0000 and
137     * value 1.0 by 0xFFFF, i.e. the values are really unsigned
138     * short values, although they are returned in a short array.
139     * @return a short array representing the TRC.
140     * @exception ProfileDataException if the profile does not specify
141     *            the TRC as a table.
142     */
143    public short[] getTRC() {
144    short[]    theTRC;
145
146        theTRC = super.getTRC(ICC_Profile.icSigGrayTRCTag);
147        return theTRC;
148    }
149
150}
151