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94<h1 class="text-center">Resources</h1>
95<p class="text-center"><a href="resources.html#configure">Configuration Files</a> • <a href="resources.html#modules">Modules</a> • <a href="resources.html#fonts">Fonts</a> • <a href="resources.html#environment">Environment Variables</a></p>
96
97<p class="lead magick-description">ImageMagick depends on a number of external resources including configuration files, loadable modules, fonts, and environment variables.</p>
98
99<h2><a class="anchor" id="configure"></a>Configuration Files</h2>
100
101<p>ImageMagick depends on a number of external configuration files detailed here:</p>
102
103<dl class="row">
104<dt class="col-md-4"><a href="https://imagemagick.org/source/coder.xml">coder.xml</a></dt>
105  <dd class="col-md-8">Associate an image format with the specified coder module.
106
107  ImageMagick has a number of coder modules to support the reading and/or writing of an image format (e.g. JPEG).  Some coder modules support more than one associated image format and the mapping between an associated format and its respective coder module is defined in this configuration file.  For example, the PNG coder module not only supports the PNG image format, but the JNG and MNG formats as well.
108  </dd>
109
110<dt class="col-md-4"><a href="https://imagemagick.org/source/colors.xml">colors.xml</a></dt>
111  <dd class="col-md-8">Associate a color name with its red, green, blue, and alpha intensities.
112
113  A number of command line options require a <a href="color.html">color parameter</a>.  It is often convenient to refer to a color by name (e.g. white) rather than by hex value (e.g. #fff).  This file maps a color name to its equivalent red, green, blue, and alpha intensities (e.g. for white, red = 255, green = 255, blue = 255, and alpha = 0).
114  </dd>
115
116<dt class="col-md-4"><a class="anchor" id="configure.xml"/><a href="https://imagemagick.org/source/configure.xml">configure.xml</a></dt>
117  <dd class="col-md-8">Set ImageMagick build parameters and system-wide environment variables (e.g. MAGICK_TEMPORARY_PATH).
118  As ImageMagick is built, a number of build parameters are saved to this configuration file.  They include the version, release date, dependent delegate libraries, and quantum depth among others.
119  </dd>
120
121<dt class="col-md-4"><a href="https://imagemagick.org/source/delegates.xml">delegates.xml</a></dt>
122  <dd class="col-md-8">Associate delegate programs with certain image formats.
123
124  ImageMagick relies on a number of delegate programs to support certain image formats such as <a href="http://ufraw.sourceforge.net/">ufraw-batch</a> to read raw camera formats or <a href="http://www.cs.wisc.edu/~ghost/">Ghostscript</a> to read Postscript images.  Use this configuration file to map an input or output format to an external delegate program.
125  </dd>
126
127<dt class="col-md-4"><a href="https://imagemagick.org/source/english.xml">english.xml</a></dt>
128  <dd class="col-md-8">Associate message tags with English translations.</dd>
129
130<dt class="col-md-4"><a href="https://imagemagick.org/source/francais.xml">francais.xml</a></dt>
131  <dd class="col-md-8">Associate message tags with French translations.  </dd>
132
133<dt class="col-md-4"><a href="https://imagemagick.org/source/locale.xml">locale.xml</a></dt>
134  <dd class="col-md-8">Associate message tags with a  translation for your locale.
135
136  ImageMagick has a number of informational, warning, and error messages that are represented as tags.  Tags are short descriptions of a message such as
137  <var>FileNotFound</var> or <var>MemoryAllocationFailed</var>.  This configuration file lists locales that have a translation for each tag recognized by ImageMagick.  Currently only English and French translations are available in the <code>english.xml</code> and <code>francais.xml</code> configuration files.
138  </dd>
139
140<dt class="col-md-4"><a href="https://imagemagick.org/source/log.xml">log.xml</a></dt>
141  <dd class="col-md-8">Configure logging parameters.
142  ImageMagick is capable of spewing copious amounts of informational or debugging statements.  Use this file to configure how the information will appear in a log message and where you want the logging messages posted.
143  </dd>
144
145<dt class="col-md-4"><a href="https://imagemagick.org/source/mime.xml">mime.xml</a></dt>
146  <dd class="col-md-8">Associate an internet media type with a unique identifier.
147  Many files and data streams have identifiers that uniquely identify a
148particular internet media type. For example, files in the "Corel Draw
149drawing" format (mime type="application/vnd.corel-draw") are associated with
150the filename pattern <code>*.cdr</code>, and also have an initial string of the
151characters "CDRXvrsn". ImageMagick uses combinations of this information,
152when available, to attempt to quickly determine the internet media type of a
153file or data stream.
154</dd>
155
156<dt class="col-md-4"><a href="https://imagemagick.org/source/policy.xml">policy.xml</a></dt>
157  <dd class="col-md-8">Configure ImageMagick policies.
158  By default any coder, delegate, filter, or file path is permitted.  Use a policy to deny access to, for example, the MPEG video delegate, or permit reading images from a file system but deny writing to that same file system.  Or use the resource policy to set resource limits.  Policies are useful for multi-user servers that want to limit the overall impact ImageMagick has on the system.  For example, to limit the maximum image size in memory to 100MP:
159
160<pre class="highlight"><code>&lt;policy domain="resource" name="area" value="100MP"/></code></pre>
161
162Any image larger than this area limit is cached to disk rather than memory.
163
164Use <code>width</code> to limit the maximum width of an image in pixels.  Exceed this limit and an exception is thrown and processing stops.
165
166<pre class="highlight"><code>&lt;policy domain="resource" name="width" value="8KP"/></code></pre>
167
168To limit the elapsed time of any ImageMagick command to 5 minutes, use this policy:
169
170<pre class="highlight"><code>&lt;policy domain="resource" name="time" value="300"/></code></pre>
171Define arguments for the memory, map, and disk resources with SI prefixes (.e.g 100MB).  In addition, resource policies are maximums for each instance of ImageMagick (e.g. policy memory limit 1GB, the <code>-limit 2GB</code> option exceeds policy maximum so memory limit is 1GB). </dd>
172
173<dt class="col-md-4"><a href="https://imagemagick.org/source/quantization-table.xml">quantization-table.xml</a></dt>
174  <dd class="col-md-8">Custom JPEG quantization tables. Activate with <code>-define:q-table=quantization-table.xml</code>.</dd>
175
176<dt class="col-md-4"><a href="https://imagemagick.org/source/thresholds.xml">thresholds.xml</a></dt>
177  <dd class="col-md-8">Set threshold maps for ordered posterized dither.</dd>
178
179<dt class="col-md-4"><a class="anchor" id="type.xml"></a><a href="https://imagemagick.org/source/type.xml">type.xml</a></dt>
180  <dd class="col-md-8">Configure fonts.
181  Define the font name, family, foundry, style, format, metrics, and glyphs for any font you want to use within ImageMagick.
182  </dd>
183
184<dt class="col-md-4"><a href="https://imagemagick.org/source/type-ghostscript.xml">type-ghostscript.xml</a></dt>
185  <dd class="col-md-8">Configure <a href="http://www.cs.wisc.edu/~ghost/">Ghostscript</a> fonts.
186  The Ghostscript package includes a number of <a href="https://sourceforge.net/projects/gs-fonts/">fonts</a> that can be accessed with ImageMagick.
187  </dd>
188
189<dt class="col-md-4"><a href="https://imagemagick.org/source/type-windows.xml">type-windows.xml</a></dt>
190  <dd class="col-md-8">Associate names with Windows font glyphs.</dd>
191</dl>
192
193<p>Under Unix and Linux, ImageMagick searches for each of the configuration files listed above by looking in the locations given below, in order, and loads them if found:</p>
194
195<pre class="highlight"><code>$MAGICK_CONFIGURE_PATH
196$PREFIX/etc/ImageMagick-7
197$PREFIX/share/ImageMagick-7
198$XDG_CACHE_HOME/ImageMagick
199$HOME/.config/ImageMagick
200&lt;<var>client path</var>&gt;/etc/ImageMagick</code></pre>
201
202<p>The environmental variable $PREFIX is the default install path (e.g. <code>/usr/local</code>). The <var>client path</var> is the execution path of your ImageMagick client (e.g. <code>/usr/local</code>) .</p>
203
204<p>For the Unix or Linux pre-compiled uninstalled binary distributions, the configuration load order is:</p>
205
206<pre class="highlight"><code>$MAGICK_CONFIGURE_PATH
207$MAGICK_HOME/etc/ImageMagick-7
208$MAGICK_HOME/share/ImageMagick-7
209$PREFIX/share/ImageMagick-7
210$XDG_CACHE_HOME/ImageMagick
211$HOME/.config/ImageMagick/
212&lt;<var>client path</var>&gt;/etc/ImageMagick
213&lt;<var>current directory</var>&gt;</code></pre>
214
215<p>Under Windows, ImageMagick searches for these configuration files in the following order, and loads them if found:</p>
216
217<pre class="highlight"><code>$MAGICK_CONFIGURE_PATH
218&lt;<var>windows registry</var>&gt;
219$PREFIX/config
220$USERPROFILE/.config/ImageMagick
221&lt;<var>client path</var>&gt;</code></pre>
222
223<p>Above, $PREFIX is the default install path, typically <code>c:\\Program Files\\ImageMagick-7.0.10</code>.</p>
224
225<p>For an uninstalled Windows installation, the configuration load order is:</p>
226
227<pre class="highlight"><code>$MAGICK_CONFIGURE_PATH
228$MAGICK_HOME
229$USERPROFILE/.config/ImageMagick
230<var>client path</var>
231&lt;<var>current directory</var>&gt;</code></pre>
232
233<p>If a configuration file cannot not be found, ImageMagick relies on built-in default values.</p>
234
235<h2><a class="anchor" id="modules"></a>Modules</h2>
236
237<h5>Coders</h5>
238<p>An image coder (i.e. encoder / decoder) is responsible for registering, optionally classifying, optionally reading, optionally writing, and unregistering one image format (e.g. PNG, GIF, JPEG, etc.).  ImageMagick searches for coders in the following order and it uses the first match found:</p>
239
240<pre class="highlight"><code>$MAGICK_HOME/lib/ImageMagick-7.0.10/modules-Q16/coders
241&lt;<var>client path</var>&gt;/../lib/ImageMagick-7.0.10/modules-Q16/coders
242$MAGICK_HOME/lib/ImageMagick-7.0.10/modules-Q16/coders
243$MAGICK_HOME/share/ImageMagick-7.0.10/modules-Q16/coders
244$XDG_CACHE_HOME/ImageMagick
245$HOME/.config/ImageMagick
246&lt;<var>client path</var>&gt;/lib/ImageMagick-7.0.10/modules-Q16/coders</code></pre>
247
248<h5>Filters</h5>
249<p>ImageMagick provides a convenient mechanism for adding your own custom image processing algorithms.  ImageMagick searches for filters in the following order and it uses the first match found:</p>
250<pre class="highlight"><code>$MAGICK_HOME/lib/ImageMagick-7.0.10/modules-Q16/filters
251&lt;<var>client path</var>&gt;/../lib/ImageMagick-7.0.10/modules-Q16/filters
252$MAGICK_HOME/lib/ImageMagick-7.0.10/modules-Q16/filters
253$MAGICK_HOME/share/ImageMagick-7.0.10/modules-Q16/filters
254$XDG_CACHE_HOME/ImageMagick
255$HOME/.config/ImageMagick
256&lt;<var>client path</var>&gt;/lib/ImageMagick-7.0.10/modules-Q16/filters</code></pre>
257
258<h2><a class="anchor" id="fonts"></a>Fonts</h2>
259
260<p>ImageMagick is able to load raw TrueType and Postscript font files.  It searches for the font configuration file, <a href="resources.html#type.xml">type.xml</a>, in the following order, and loads them if found:</p>
261
262<pre class="highlight"><code>$MAGICK_CONFIGURE_PATH
263$MAGICK_HOME/etc/ImageMagick/-7.0.10
264$MAGICK_HOME/share/ImageMagick-7.0.10
265$XDG_CACHE_HOME/ImageMagick
266$HOME/.config/ImageMagick
267&lt;<var>client path</var>&gt;/etc/ImageMagick
268$MAGICK_FONT_PATH</code></pre>
269
270<h2><a class="anchor" id="environment"></a>Environment Variables</h2>
271
272<p>Environment variables recognized by ImageMagick include:</p>
273
274<div class="table-responsive" style="font-size:87.5% !important;">
275<table class="table table-sm table-hover">
276  <tr>
277    <td>HOME</td>
278    <td>Set path to search for configuration files in <code>$HOME/.config/ImageMagick</code> if the directory exists.</td>
279  </tr>
280  <tr>
281    <td>LD_LIBRARY_PATH</td>
282    <td>Set path to the ImageMagick shareable libraries and other dependent libraries.</td>
283  </tr>
284  <tr>
285    <td>MAGICK_AREA_LIMIT</td>
286    <td>Set the maximum <var>width * height</var> of an image that can reside in the pixel cache memory.  Images that exceed the area limit are cached to disk (see <a href="resources.html#disk-limit">MAGICK_DISK_LIMIT</a>) and optionally memory-mapped.</td>
287  </tr>
288  <tr>
289    <td>MAGICK_CODER_FILTER_PATH</td>
290    <td>Set search path to use when searching for filter process modules (invoked via  <a href="../www/command-line-options.html#process">-process</a>).  This path permits the user to extend ImageMagick's image processing functionality by adding loadable modules to a preferred location rather than copying them into the ImageMagick installation directory.  The formatting of the search path is similar to operating system search paths (i.e. colon delimited for Unix, and semi-colon delimited for Microsoft Windows). This user specified search path is searched before trying the <a href="resources.html#modules">default search path</a>.</td>
291  </tr>
292  <tr>
293    <td>MAGICK_CODER_MODULE_PATH</td>
294    <td>Set path where ImageMagick can locate its coder modules.  This path permits the user to arbitrarily extend the image formats supported by ImageMagick by adding loadable coder modules from an preferred location rather than copying them into the ImageMagick installation directory.  The formatting of the search path is similar to operating system search paths (i.e. colon delimited for Unix, and semi-colon delimited for Microsoft Windows). This user specified search path is searched before trying the <a href="resources.html#modules">default search path</a>.</td>
295  </tr>
296  <tr>
297    <td>MAGICK_CONFIGURE_PATH</td>
298    <td>Set path where ImageMagick can locate its configuration files.  Use this search path to search for configuration (.xml) files. The formatting of the search path is similar to operating system search paths (i.e. colon delimited for Unix, and semi-colon delimited for Microsoft Windows). This user specified search path is searched before trying the <a href="resources.html#configure">default search path</a>.</td>
299  </tr>
300  <tr>
301    <td>MAGICK_DEBUG</td>
302    <td>Set debug options.  See <a href="../www/command-line-options.html#debug">-debug</a> for a description of debugging options.</td>
303  </tr>
304  <tr>
305    <td><a class="anchor" id="disk-limit"></a>MAGICK_DISK_LIMIT</td>
306    <td>Set maximum amount of disk space in bytes permitted for use by the pixel cache.  When this limit is exceeded, the pixel cache is not be created and an error message is returned.</td>
307  </tr>
308  <tr>
309    <td>MAGICK_ERRORMODE</td>
310    <td>Set the process error mode (Windows only).  A typical use might be a value of 1 to prevent error mode dialogs from displaying a message box and hanging the application.</td>
311  </tr>
312  <tr>
313    <td>MAGICK_FILE_LIMIT</td>
314    <td>Set maximum number of open pixel cache files.  When this limit is exceeded, any subsequent pixels cached to disk are closed and reopened on demand.  This behavior permits a large number of images to be accessed simultaneously on disk, but with a speed penalty due to repeated open/close calls.</td>
315  </tr>
316  <tr>
317    <td>MAGICK_FONT_PATH</td>
318    <td>Set path ImageMagick searches for TrueType and Postscript Type1 font files.  This path is only consulted if a particular font file is not found in the current directory.</td>
319  </tr>
320  <tr>
321    <td>MAGICK_HEIGHT_LIMIT</td>
322    <td>Set the maximum <var>height</var> of an image.</td>
323  </tr>
324  <tr>
325    <td>MAGICK_HOME</td>
326    <td>Set the path at the top of ImageMagick installation directory.  This path is consulted by <var>uninstalled</var> builds of ImageMagick which do not have their location hard-coded or set by an installer.</td>
327  </tr>
328  <tr>
329    <td>MAGICK_LIST_LENGTH_LIMIT</td>
330    <td>Set the maximum length of an image sequence.</td>
331  </tr>
332  <tr>
333    <td><a class="anchor" id="map-limit"></a>MAGICK_MAP_LIMIT</td>
334    <td>Set maximum amount of memory map in bytes to allocate for the pixel cache.  When this limit is exceeded, the image pixels are cached to disk (see MAGICK_DISK_LIMIT).</td>
335  </tr>
336  <tr>
337    <td>MAGICK_MEMORY_LIMIT</td>
338    <td>Set maximum amount of memory in bytes to allocate for the pixel cache from the heap.  When this limit is exceeded, the image pixels are cached to memory-mapped disk (see <a href="resources.html#map-limit">MAGICK_MAP_LIMIT</a>).</td>
339  </tr>
340  <tr>
341    <td>MAGICK_OCL_DEVICE</td>
342    <td>Set to <code>off</code> to disable hardware acceleration of certain accelerated algorithms (e.g. blur, convolve, etc.).</td>
343  </tr>
344  <tr>
345    <td>MAGICK_PRECISION</td>
346    <td>Set the maximum number of significant digits to be printed.</td>
347  </tr>
348  <tr>
349    <td>MAGICK_SHRED_PASSES</td>
350    <td>If you want to keep the temporary files ImageMagick creates private, overwrite them with zeros or random data before they are removed.  On the first pass, the file is zeroed.  For subsequent passes, random data is written.</td>
351  </tr>
352  <tr>
353    <td>MAGICK_SYNCHRONIZE</td>
354    <td>Set to "true" to ensure all image data is fully flushed and synchronized to disk. There is a performance penalty, however, the benefits include ensuring a valid image file in the event of a system crash and early reporting if there is not enough disk space for the image pixel cache.</td>
355  </tr>
356  <tr>
357    <td>MAGICK_TEMPORARY_PATH</td>
358    <td>Set path to store temporary files.</td>
359  </tr>
360  <tr>
361    <td>MAGICK_THREAD_LIMIT</td>
362    <td>Set maximum parallel threads.  Many ImageMagick algorithms run in parallel on multi-processor systems.  Use this environment variable to set the maximum number of threads that are permitted to run in parallel.</td>
363  </tr>
364  <tr>
365    <td>MAGICK_THROTTLE_LIMIT</td>
366    <td>Periodically yield the CPU for at least the time specified in milliseconds.</td>
367  </tr>
368  <tr>
369    <td>MAGICK_TIME_LIMIT</td>
370    <td>Set maximum time in seconds.  When this limit is exceeded, an exception is thrown and processing stops.</td>
371  </tr>
372  <tr>
373    <td>MAGICK_WIDTH_LIMIT</td>
374    <td>Set the maximum <var>width</var> of an image.</td>
375  </tr>
376  <tr>
377    <td>SOURCE_DATE_EPOCH</td>
378    <td>A UNIX timestamp, defined as the number of seconds, excluding leap seconds, since <code>01 Jan 1970 00:00:00 UTC</code>.</td>
379  </tr>
380</table></div>
381
382<p>Define arguments for the <code>MAGICK_MEMORY_LIMIT</code>, <code>MAGICK_DISK_LIMIT</code>, and <code>MAGICK_MEMORY_LIMIT</code> environment variables with SI prefixes (.e.g <code>100MB</code>). <code>MAGICK_WIDTH_LIMIT</code>, <code>MAGICK_HEIGHT_LIMIT</code> and <code>MAGICK_AREA_LIMIT</code> accepts pixel suffixes such as MP for mega-pixels (e.g. 100MP).</p>
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