1<?xml version="1.0" encoding="UTF-8"?>
2<!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
3                       "http://www.docbook.org/xml/4.3/docbookx.dtd">
4<!-- section history:
5  2017-04-04 elle stone: add convert-to-color-profile.xml
6-->
7<sect2 id="gimp-image-convert-to-color-profile">
8  <title>Convert to Color Profile</title>
9
10  <indexterm>
11    <primary>Image</primary>
12    <secondary>Color Management</secondary>
13    <tertiary>Convert to Color Profile</tertiary>
14  </indexterm>
15  <indexterm>
16    <primary>Color Management</primary>
17    <secondary>Convert to Color Profile</secondary>
18  </indexterm>
19  <indexterm>
20    <primary>Convert to Color Profile</primary>
21  </indexterm>
22
23  <para>
24    The <guimenuitem>Convert to Color Profile</guimenuitem> allows you to
25    convert an image from its currently assigned ICC profile to another
26    ICC profile.
27  </para>
28
29  <sect3>
30    <title>Activating the command</title>
31        <para>
32          You can access this command from the image menu bar through
33          <menuchoice>
34            <guimenu>Image</guimenu>
35            <guisubmenu>Color Management</guisubmenu>
36            <guimenuitem>Convert to Color Profile</guimenuitem>
37          </menuchoice>.
38        </para>
39
40  </sect3>
41
42  <sect3>
43    <title>Use Notes for <guimenuitem>Convert to Color Profile</guimenuitem></title>
44    <para>
45      In an ICC profile color managed editing application such as GIMP,
46      every image has an assigned ICC color profile that (among other things)
47      tells the Color Management System (in GIMP's case
48      <ulink url="http://www.littlecms.com/">Little CMS</ulink>) what color
49      space to use when sending the image to the screen.
50    </para>
51    <para>
52      Sometimes it's convenient or necessary to convert an image from
53      its currently assigned ICC color profile to another ICC color profile.
54      For example:
55    </para>
56    <orderedlist>
57      <listitem>
58        <para>
59          Perhaps you want to convert the image from some other
60          color space to GIMP's built-in sRGB color space.
61        </para>
62      </listitem>
63      <listitem>
64        <para>
65          Perhaps you want to convert the image to a printer
66          profile before sending it out to a printing establishment.
67        </para>
68      </listitem>
69      <listitem>
70        <para>
71          Perhaps the currently assigned color space is not the
72          right color space for the editing task at hand.
73        </para>
74      </listitem>
75    </orderedlist>
76  </sect3>
77
78  <sect3>
79    <title>An example with screenshots showing how to use
80    <guimenuitem>Convert to Color Profile</guimenuitem></title>
81
82    <para>
83      Let's say you have just finished editing an image. You edited the
84      image in GIMP's built-in sRGB color space and now you want to convert a
85      flattened copy of the image to a printer profile before sending it
86      off to be printed. The screenshots below show the procedure:
87    </para>
88
89    <orderedlist>
90      <listitem>
91        <para>
92          Select <quote>Image/Color Management/Convert to Color Profile</quote>
93          to bring up the
94          <guimenuitem>Convert to ICC Color Profile</guimenuitem> dialog:
95        </para>
96        <mediaobject>
97          <imageobject>
98            <imagedata fileref="images/menus/image/color-management/convert-1.png" format="PNG"/>
99          </imageobject>
100        </mediaobject>
101      </listitem>
102
103      <listitem>
104        <para>
105          Under <guilabel>Current Color Profile</guilabel> is a description
106        of the currently assigned color profile, in this case GIMP's built-in
107        sRGB profile. Clicking on the "+" icon next to the description of the
108        currently assigned profile displays the contents of various information
109        tags in the assigned ICC profile.
110        </para>
111        <para>
112          Clicking on the "+" icons next to the words
113          <guilabel>Profile details</guilabel> displays the contents of various
114          information tags in the ICC profile that you pick as the profile to which
115          the image will be converted. Until you've actually picked a new profile,
116          the profile in the <guilabel>Convert to</guilabel> box defaults to a GIMP
117          built-in sRGB profile.
118        </para>
119        <para>
120          The screenshot below shows example profile descriptions
121          revealed by clicking on the "+" icons:
122        </para>
123        <mediaobject>
124          <imageobject>
125            <imagedata fileref="images/menus/image/color-management/convert-2.png" format="PNG"/>
126          </imageobject>
127        </mediaobject>
128      </listitem>
129
130      <listitem>
131        <para>
132          Between <guilabel>Convert to</guilabel> and
133          <guilabel>Profile details</guilabel> is a drop-down box that allows
134          you to pick a new profile. Clicking in the drop-down box brings up a list
135          of recently used profiles (if any). At the bottom of the list is an option
136          to <guilabel>Select color profile from disk...</guilabel>:
137        </para>
138        <mediaobject>
139          <imageobject>
140            <imagedata fileref="images/menus/image/color-management/convert-3.png" format="PNG"/>
141          </imageobject>
142        </mediaobject>
143      </listitem>
144
145      <listitem>
146        <para>
147          Clicking on <guilabel>Select color profile from disk...</guilabel>
148          brings up the <guimenuitem>Select Destination Profile</guimenuitem>
149          dialog for navigating to the disk location of the profile that you want
150          to select from disk. The box has three panels:
151        </para>
152        <orderedlist>
153          <listitem>
154            <para>
155              The panel on the left allows you to navigate your
156              on-disk folder structure to the folder of your choice.
157            </para>
158          </listitem>
159          <listitem>
160            <para>
161              The center panel initially shows another list of
162              recently used profiles.
163            </para>
164          </listitem>
165          <listitem>
166            <para>
167              If you click on one of the recently used profiles,
168              the right panel will show informational tags that are embedded in
169              the selected profile.
170            </para>
171          </listitem>
172        </orderedlist>
173        <mediaobject>
174          <imageobject>
175            <imagedata fileref="images/menus/image/color-management/convert-4.png" format="PNG"/>
176          </imageobject>
177        </mediaobject>
178        <para>
179          As the desired profile is shown in the list of
180          recently used profiles, the profile can be directly selected from
181          the list of recently used profiles by clicking on the
182          <guilabel>Open</guilabel> button in the lower right corner. Or as shown in
183          the next screenshot,it can be selected by navigating to the profile's
184          location on disk.
185        </para>
186        <note>
187          <para>
188            "Destination profile" is the technical
189            term for the profile to which you want to convert your image. Similarly,
190            "source profile" refers to the current ICC color space (the color
191            space the image is already in, before you convert it to the destination
192            profile).
193          </para>
194        </note>
195      </listitem>
196
197      <listitem>
198        <para>
199          As shown in the screenshot below, the left and center
200          panels of the <guimenuitem>Select Destination Profile</guimenuitem>
201          dialog allow you to navigate to where your ICC profiles are stored on
202          disk, and then pick the desired destination ICC color profile, and the
203          right panel displays informational tags embedded in the selected profile.
204          Click on the <guilabel>Open</guilabel> button to select the
205          "Destination Profile".
206        </para>
207        <mediaobject>
208          <imageobject>
209            <imagedata fileref="images/menus/image/color-management/convert-5.png" format="PNG"/>
210          </imageobject>
211        </mediaobject>
212      </listitem>
213
214      <listitem>
215        <para>
216          Clicking on the <guilabel>Open</guilabel> button
217          returns you to the <guimenuitem>Convert to ICC Color Profile</guimenuitem>
218          dialog, allowing you a chance to either convert to the selected profile or
219          else pick a new profile:
220        </para>
221        <mediaobject>
222          <imageobject>
223            <imagedata fileref="images/menus/image/color-management/convert-6.png" format="PNG"/>
224          </imageobject>
225        </mediaobject>
226      </listitem>
227
228      <listitem>
229        <para>
230          Once you are sure you've picked the right
231          profile, the next step is to select the desired conversion options:
232        </para>
233        <mediaobject>
234          <imageobject>
235            <imagedata fileref="images/menus/image/color-management/convert-7.png" format="PNG"/>
236          </imageobject>
237        </mediaobject>
238        <para>
239          Selecting the desired conversion options requires two decisions:
240        </para>
241        <orderedlist>
242          <listitem>
243            <para>
244              Choose a rendering intent from the
245              <guilabel>Rendering Intent</guilabel> drop-down box. The ICC profile
246              rendering intents are:
247            </para>
248            <itemizedlist>
249              <listitem>
250                <para>
251                  <guilabel>Perceptual</guilabel>
252                </para>
253              </listitem>
254              <listitem>
255                <para>
256                  <guilabel>Relative Colorimetric</guilabel>
257                </para>
258              </listitem>
259              <listitem>
260                <para>
261                  <guilabel>Saturation</guilabel>
262                </para>
263              </listitem>
264              <listitem>
265                <para>
266                  <guilabel>Absolute</guilabel>
267                </para>
268              </listitem>
269            </itemizedlist>
270          </listitem>
271
272          <listitem>
273            <para>
274              Decide whether to use black point compensation:
275            </para>
276            <itemizedlist>
277              <listitem>
278                <para>
279                  To use black point compensation, the
280                  <guilabel>Black Point Compensation</guilabel> box should be
281                  checked.
282                </para>
283              </listitem>
284              <listitem>
285                <para>
286                  To not use black point compensation, the
287                  <guilabel>Black Point Compensation</guilabel> box should be
288                  unchecked.
289                </para>
290              </listitem>
291            </itemizedlist>
292          </listitem>
293        </orderedlist>
294      <!--<para>
295        For information about choosing a rendering intent and whether
296        to use black point compensation, see (page not yet written, should go
297        in the Color Management section of the documentation).
298      </para>-->
299      </listitem>
300
301      <listitem>
302        <para>
303          When you've picked the desired conversion options, click
304          on the <guilabel>Convert</guilabel> button in the lower right corner, and the image will be
305          converted to the selected destination profile, in the current example,
306          an RGB printer profile:
307        </para>
308        <mediaobject>
309          <imageobject>
310            <imagedata fileref="images/menus/image/color-management/convert-before-after.png" format="PNG"/>
311          </imageobject>
312        </mediaobject>
313      </listitem>
314    </orderedlist>
315
316  </sect3>
317
318</sect2>
319