1 /*
2 * Portions Copyright 1997-2007 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 /**********************************************************************
27 **********************************************************************
28 **********************************************************************
29 *** COPYRIGHT (c) Eastman Kodak Company, 1997 ***
30 *** As an unpublished work pursuant to Title 17 of the United ***
31 *** States Code. All rights reserved. ***
32 **********************************************************************
33 **********************************************************************
34 **********************************************************************/
35
36 package java.awt.color;
37
38 import java.awt.image.LookupTable;
39 import sun.java2d.cmm.ProfileDeferralInfo;
40
41 /**
42 *
43 * A subclass of the ICC_Profile class which represents profiles
44 * which meet the following criteria: the color space type of the
45 * profile is TYPE_GRAY and the profile includes the grayTRCTag and
46 * mediaWhitePointTag tags. Examples of this kind of profile are
47 * monochrome input profiles, monochrome display profiles, and
48 * monochrome output profiles. The getInstance methods in the
49 * ICC_Profile class will
50 * return an ICC_ProfileGray object when the above conditions are
51 * met. The advantage of this class is that it provides a lookup
52 * table that Java or native methods may be able to use directly to
53 * optimize color conversion in some cases.
54 * <p>
55 * To transform from a GRAY device profile color space to the CIEXYZ Profile
56 * Connection Space, the device gray component is transformed by
57 * a lookup through the tone reproduction curve (TRC). The result is
58 * treated as the achromatic component of the PCS.
59 <pre>
60
61 PCSY = grayTRC[deviceGray]
62
63 </pre>
64 * The inverse transform is done by converting the PCS Y components to
65 * device Gray via the inverse of the grayTRC.
66 * <p>
67 */
68
69
70
71 public class ICC_ProfileGray
72 extends 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(long ID) {
80 super(ID);
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 gamma
111 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 }
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