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ImageMagick depends on a number of external resources including configuration files, loadable modules, fonts, and environment variables.

## Configuration Files

ImageMagick depends on a number of external configuration files detailed here:

coder.xml
  Associate an image format with the specified coder module.

  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.

colors.xml
  Associate a color name with its red, green, blue, and alpha intensities.

  A number of command line options require a color parameter. 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).

configure.xml
  Set ImageMagick build parameters and system-wide environment variables (e.g. MAGICK_TEMPORARY_PATH).

  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.

delegates.xml
  Associate delegate programs with certain image formats.

  ImageMagick relies on a number of delegate programs to support certain image formats such as ufraw-batch to read raw camera formats or Ghostscript to read Postscript images. Use this configuration file to map an input or output format to an external delegate program.

english.xml
  Associate message tags with English translations.
francais.xml
  Associate message tags with French translations.
locale.xml
  Associate message tags with a translation for your locale.

  ImageMagick has a number of informational, warning, and error messages that are represented as tags. Tags are short descriptions of a message such as FileNotFound or MemoryAllocationFailed. 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 `english.xml` and `francais.xml` configuration files.

log.xml
  Configure logging parameters.

  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.

magic.xml
  Associate an image format with a unique identifier.

  Many image formats have identifiers that uniquely identify a particular image format. For example, the GIF image format always begins with `GIF8` as the first 4 characters of the image. ImageMagick uses this information to quickly determine the type of image it is dealing with when it reads an image.

mime.xml
  Associate an internet media type with a unique identifier.

  Many files and data streams have identifiers that uniquely identify a particular internet media type. For example, files in the "Corel Draw drawing" format (mime type="application/vnd.corel-draw") are associated with the filename pattern `*.cdr`, and also have an initial string of the characters "CDRXvrsn". ImageMagick uses combinations of this information, when available, to attempt to quickly determine the internet media type of a file or data stream.

policy.xml
  Configure ImageMagick policies.

  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 100MB:

        <policy domain="resource" name="area" value="100MB"/>

  Any image larger than this area limit is cached to disk rather than memory.

  To limit the elapsed time of any ImageMagick command to 5 minutes, use this policy:

        <policy domain="resource" name="time" value="300"/>

thresholds.xml
  Set threshold maps for ordered posterized dither.
type.xml
  Configure fonts.

  Define the font name, family, foundry, style, format, metrics, and glyphs for any font you want to use within ImageMagick.

type-ghostscript.xml
  Configure Ghostscript fonts.

  The Ghostscript package includes a number of fonts that can be accessed with ImageMagick.

type-windows.xml
  Associate names with Windows font glyphs.

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:

      $MAGICK_CONFIGURE_PATH
      $PREFIX/lib/ImageMagick-6.6.5/config
      $PREFIX/share/ImageMagick-6.6.5/config
      $PREFIX/share/ImageMagick-6.6.5  $HOME/.magick/
      <client path>/lib/ImageMagick-6.6.5/

The environmental variable $PREFIX is the default install path (e.g. `/usr/local`). The client path is the execution path of your ImageMagick client (e.g. `/usr/local`) .

For the Unix or Linux pre-compiled uninstalled binary distributions, the configuration load order is:

      $MAGICK_CONFIGURE_PATH
      $MAGICK_HOME/lib/ImageMagick-6.6.5/config
      $MAGICK_HOME/share/ImageMagick-6.6.5/config
      $PREFIX/share/ImageMagick-6.6.5  $HOME/.magick/
      <client path>/lib/ImageMagick-6.6.5/
      <current directory>

Under Windows, ImageMagick searches for these configuration files in the following order, and loads them if found:

      $MAGICK_CONFIGURE_PATH
      <windows registry>
      $PREFIX/config
      $USERPROFILE/.magick/
      <client path>

Above, $PREFIX is the default install path, typically `c:\\Program Files\\ImageMagick-6.6.5`.

For an uninstalled Windows installation, the configuration load order is:

      $MAGICK_CONFIGURE_PATH
      $MAGICK_HOME
      $USERPROFILE/.magick/
      client path
      <current directory>

If a configuration file cannot not be found, ImageMagick relies on built-in default values.

## Modules

ImageMagick's image format support is usually provided in the form of loadable modules. It searches for loadable modules in the following order and it uses the first match found:

      $MAGICK_HOME/lib/ImageMagick-6.6.5/modules-Q16/coders/
      $HOME/.magick/
      <client path>/../lib/ImageMagick-6.6.5/modules-Q16/coders/
      $MAGICK_HOME/lib/ImageMagick-6.6.5/modules-Q16/coders
      $MAGICK_HOME/share/ImageMagick-6.6.5/modules-Q16/coders
      $HOME/.magick/
      <client path>/lib/ImageMagick-6.6.5/modules-Q16/coders

## Fonts

ImageMagick is able to load raw TrueType and Postscript font files. It searches for the font configuration file, type.xml, in the following order, and loads them if found:

      $MAGICK_CONFIGURE_PATH
      $MAGICK_HOME/lib/ImageMagick-6.6.5/config
      $MAGICK_HOME/share/ImageMagick-6.6.5/config
      $HOME/.magick/
      <client path>/lib/ImageMagick-6.6.5/
      $MAGICK_FONT_PATH

## Environment Variables

Environment variables recognized by ImageMagick include:

HOME
  Set path to search for configuration files in $HOME/.magick if the directory exists.
LD_LIBRARY_PATH
  Set path to the ImageMagick shareable libraries and other dependent libraries.
MAGICK_AREA_LIMIT
  Set the maximum width * height of an image that can reside in the pixel cache memory.
  Images that exceed the area limit are cached to disk (see MAGICK_DISK_LIMIT).
MAGICK_CODER_FILTER_PATH
  Set search path to use when searching for filter process modules (invoked via -process).
  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 default search path.
MAGICK_CODER_MODULE_PATH
  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 default search path.
MAGICK_CONFIGURE_PATH
  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 default search path.
MAGICK_DEBUG
  Set debug options.
  See -debug for a description of debugging options.
MAGICK_DISK_LIMIT
  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.
MAGICK_FILE_LIMIT
  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.
MAGICK_FONT_PATH
  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.
MAGICK_HOME
  Set the path at the top of ImageMagick installation directory.
  This path is consulted by uninstalled builds of ImageMagick which do not have their location hard-coded or set by an installer.
MAGICK_MAP_LIMIT
  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).
MAGICK_MEMORY_LIMIT
  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 MAGICK_MAP_LIMIT).
MAGICK_PRECISION
  Set the maximum number of significant digits to be printed.
MAGICK_SYNCHRONIZE
  Set to true to synchronize image to storage device.
MAGICK_TEMPORARY_PATH
  Set path to store temporary files.
MAGICK_THREAD_LIMIT
  Set maximum parallel threads.
  Many ImageMagick algorithms run in parallel on multi-processor systems. Use this enviroment variable to set the maximum number of threads that are permitted to run in parallel.
MAGICK_THROTTLE
  Periodically yield the CPU for at least the time specified in milliseconds.
MAGICK_TIME_LIMIT
  Set maximum time in seconds.
  When this limit is exceeded, an exception is thrown and processing stops.

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