View Javadoc
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31   *** As  an unpublished  work pursuant to Title 17 of the United    ***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  
37  package java.awt.color;
38  
39  import sun.java2d.cmm.Profile;
40  import 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  
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(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 }