composite composites (combines) images to create new images.
base-image is the base image and change-image contains the changes.
ouput-image is the result, and normally has the same dimensions
as base-image.
The optional mask-image can be used to provide opacity information
for change-image when it has none or if you want a different mask.
A mask image is typically grayscale and the same size as
base-image. If mask-image is not grayscale, it is converted
to grayscale and the resulting intensities are used as opacity
information.
EXAMPLES
To composite an image of a cockatoo with a perch, use:
composite cockatoo.miff perch.ras composite.miff
To compute the difference between images in a series, use:
Options are processed in command line order. Any option you specify on
the command line remains in effect only for the image that follows. All
options are reset to their default values after each image is read.
For a more detailed description of each option, see
Options, above.
ImageMagick(1).
-authenticate <string>
decrypt image with this password
-background <color>
the background color
-blue-primary <x>,<y>
blue chromaticity primary point
-cache <threshold>
(This option has been replaced by the -limit option)
-colors <value>
preferred number of colors in the image
-colorspace <value>
the type of colorspace
-comment <string>
annotate an image with a comment
-compose <operator>
the type of image composition
-compress <type>
the type of image compression
-debug <events>
enable debug printout
-define <key>{=<value>},...
add coder/decoder specific options
-density <width>x<height>
horizontal and vertical resolution in pixels of the image
-depth <value>
depth of the image
-displace <horizontal scale>x<vertical scale>
shift image pixels as defined by a displacement map
-display <host:display[.screen]>
specifies the X server to contact
-dispose <method>
GIF disposal method
-dissolve <percent>
dissolve an image into another by the given percent
-dither
apply Floyd/Steinberg error diffusion to the image
For a more detailed description of each option, see
Options, above.
ImageMagick(1).
ENVIRONMENT
COLUMNS
Output screen width. Used when formatting text for the screen. Many
Unix systems keep this shell variable up to date, but it may need to be
explicitly exported in order for ImageMagick to see it.
DISPLAY
X11 display ID (host, display number, and screen in the form
hostname:display.screen).
HOME
Location of user's home directory. ImageMagick searches for
configuration files in $HOME/.magick if the directory exists. See
MAGICK_CODER_MODULE_PATH, MAGICK_CONFIGURE_PATH, and
MAGICK_FILTER_MODULE_PATH if more flexibility is needed.
MAGICK_CODER_MODULE_PATH
Search path to use when searching for image format coder modules.
This path allows the user to arbitrarily extend the image formats
supported by ImageMagick by adding loadable modules to an arbitrary
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 used
before trying the default search path.
MAGICK_CONFIGURE_PATH
Search path to use when searching for configuration (.mgk) 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 used before trying
the default search path.
MAGICK_DEBUG
Debug options (see -debug for details)
MAGICK_FILTER_MODULE_PATH
Search path to use when searching for filter process modules
(invoked via -process). This path allows the user to arbitrarily
extend ImageMagick's image processing functionality by adding loadable
modules to an arbitrary 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 used before trying the default search path.
MAGICK_FONT_PATH
Directory where ImageMagick should look for TrueType and
Postscript Type1 font files if the font file is not found in the current
directory. It is preferred to define the available fonts via type.mgk
rather than use MAGICK_FONT_PATH.
MAGICK_HOME
Path to top of ImageMagick installation directory. Only observed
by "uninstalled" builds of ImageMagick which do not have their location
hard-coded or set by an installer.
MAGICK_DISK_LIMIT
Maximum amount of disk space allowed for use by the pixel cache.
MAGICK_FILES_LIMIT
Maximum number of open files.
MAGICK_MAP_LIMIT
Maximum size of a memory map.
MAGICK_MEMORY_LIMIT
Maximum amount of memory to allocate from the heap.
MAGICK_TMPDIR
Path to directory where ImageMagick should write temporary
files. The default is to use the system default, or the location set by
TMPDIR.
TMPDIR
For POSIX-compatible systems (Unix-compatible), the path to the
directory where all applications should write temporary files.
Overridden by MAGICK_TMPDIR if it is set.
TMP or TEMP
For Microsoft Windows, the path to the directory where applications
should write temporary files. Overridden by MAGICK_TMPDIR if it
is set.
CONFIGURATION FILES
ImageMagick uses a number of XML format configuration files: