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RedHat 9 (Linux i386) - man page for miff (redhat section 4)

MIFF(4) 			     Kernel Interfaces Manual				  MIFF(4)

NAME
       MIFF - Magick Image File Format is a platform-independent format for storing bitmap
       images.	MIFF is a part of the ImageMagick toolkit of image manipulation utilities for the
       X Window System.  ImageMagick is capable of converting many different image file formats
       to and from MIFF (e.g. JPEG, XPM, TIFF, etc.).

SYNOPSIS
       #include <image.h>

DESCRIPTION
       A MIFF image file consist of two sections.  The first section is a header composed of keys
       describing the image in text form.  The next section is the binary image data.  The header
       is separated from the image data by a : character immediately followed by a newline.

       The MIFF header is composed entirely of LATIN-1 characters.  The fields in the header are
       key and value combination in the key=value format, with each key and value separated by an
       equal sign (=).	Each key=value combination is delimited by at least one control or white-
       space character.  Comments may appear in the header section and are always delimited by
       braces.	The MIFF header always ends with a colon (:) character, followed by a ctrl-Z
       character.  It is also common to proceed the colon with a formfeed and a newline charac-
       ter.  The formfeed prevents the listing of binary data when using more(1) under Unix where
       the ctrl-Z has the same effect with the type command on the Win32 command line.

       The following is a list of key=value combinations that may be found in a MIFF file:

       background-color=color
	      border-color=color matte-color=color these optional keys reflects the image back-
	      ground, border, and matte colors respectively. A color can be a name (e.g. white)
	      or a hex value (e.g. #ccc).

       class=DirectClass
	      class=PseudoClass the type of binary image data stored in the MIFF file.	If this
	      key is not present, DirectClass image data is assumed.

       colors=value
	      the number of colors in a DirectClass image. For a PseudoClass image, this key
	      specifies the size of the colormap.  If this key is not present in the header, and
	      the image is PseudoClass, a linear 256 color grayscale colormap is used with the
	      image data.  The maximum number of colormap entries is 65535.  colorspace=CMYK the
	      colorspace of the pixel data.  The default is RGB.

       columns=value
	      the width of the image in pixels.  This is a required key and has no default.

       compression=BZip
	      compression=Fax compression=JPEG compression=LZW compression=RunlengthEncoded com-
	      pression=Zip the type of algorithm used to compress the image data.  If this key is
	      not present, the image data is assumed to be uncompressed.

       delay <1/100ths of a second>
	      the interframe delay in an image sequence.  The maximum delay is 65535.

       depth=8
	      depth=16 the depth of a single color value representing values from 0 to 255 (depth
	      8) or 65535 (depth 16).  If this key is absent, a depth of 8 is assumed.

       dispose value
	      GIF disposal method.

	      Here are the valid methods:

		   0  No disposal specified.
		   1  Do not dispose between frames.
		   2  Overwrite frame with background color from header.
		   3  Overwrite with previous frame.

       gamma=value
	      the gamma of the image.  If it is not specified, a gamma of 1.0 (linear brightness
	      response) is assumed,

       id=ImageMagick
	      identifies the file as a MIFF-format image file.	This key is required and has no
	      default.	Although this key can appear anywhere in the header, it should start as
	      the first key of the header in column 1.	This will allow programs like file(1) to
	      easily identify the file as MIFF.

       iterations value
	      the number of times an image sequence loops before stopping.

       label={value}
	      defines a short title or caption for the image.  If any whitespace appears in the
	      label, it must be enclosed within braces.

       matte=True
	      matte=False specifies whether a DirectClass image has matte data.  Matte data is
	      generally useful for image compositing.  This key has no meaning for pseudo-color
	      images.

       montage=<width>x<height>{+-}<x offset>{+-}<y offset>
	      size and location of the individual tiles of a composite image.  See X(1) for
	      details about the geometry specification.

	      Use this key when the image is a composite of a number of different tiles.  A tile
	      consists of an image and optionally a border and a label.  <width> is the size in
	      pixels of each individual tile in the horizontal direction and <height> is the size
	      in the vertical direction.  Each tile must have an equal number of pixels in width
	      and equal in height.  However, the width can differ from the height.  <x offset> is
	      the offset in number of pixels from the vertical edge of the composite image where
	      the first tile of a row begins and <y offset> is the offset from the horizontal
	      edge where the first tile of a column begins.

	      If this key is specified, a directory of tile names must follow the image header.
	      The format of the directory is explained below.

       page=value
	      preferred size and location of an image canvas.

       profile-icc=value
	      the number of bytes in the International Color Consortium color profile.	The pro-
	      file is defined by the ICC profile specification located at ftp://sgi-
	      gate.sgi.com/pub/icc/icc34.ps.

       colorspace=RGB

       red-primary=x,y
	      green-primary=x,y blue-primary=x,y white-point=x,y this optional key reflects the
	      chromaticity primaries and white point.

       rendering-intent=saturation
	      rendering-intent=perceptual rendering-intent=absolute rendering-intent=relative
	      Rendering intent is the CSS-1 property that has been defined by the International
	      Color Consortium (http://www.color.org).

       resolution=<x-resolution>x<y-resolution>
	      vertical and horizontal resolution of the image.	See units for the specific reso-
	      lution units (e.g. pixels per inch).

       rows=value
	      the height of the image in pixels.  This is a required key and has no default.

       scene=value
	      the sequence number for this MIFF image file.  This optional key is used when a
	      MIFF image file is one in a sequence of files used in an animation.

       signature=value
	      this optional key contains a string that uniquely identifies the image pixel con-
	      tents.  NIST's SHA-256 message digest algorithm is recommended.

       units=pixels-per-inch
	      units=pixels-per-centimeter image resolution units.

	      Other key value pairs are permitted.  If a value contains whitespace it must be
	      enclosed with braces as illustrated here:

		  id=ImageMagick
		  class=PseudoClass  colors=256
		  compression=RunlengthEncoded	packets=27601
		  columns=1280	rows=1024
		  signature=d79e1c308aa5bbcdeea8ed63df412da9
		  copyright={Copyright (c) 2001 ImageMagick Studio}
		  <FF>
		  :

       Note that key=value combinations may be separated by newlines or spaces and may occur in
       any order within the header.  Comments (within braces) may appear anywhere before the
       colon.

       If you specify the montage key in the header, follow the header with a directory of image
       tiles.  This directory consists of a name for each tile of the composite image separated
       by a newline character.	The list is terminated with a NULL character.

       If you specify the color-profile key in the header, follow the header (or montage direc-
       tory if the montage key is in the header) with the binary color profile.

       Next comes the binary image data itself.  How the image data is formatted depends upon the
       class of the image as specified (or not specified) by the value of the class key in the
       header.

       DirectClass images (class=DirectClass) are continuous-tone, images stored as RGB (red,
       green, blue), RGBA (red, green, blue, alpha), or CMYK (cyan, yellow, magenta, black)
       intensity values as defined by the colorspace key. Each intensity value is one byte in
       length for images of depth 8 (0..255), whereas, images of depth 16 (0..65535) require two
       bytes in most significant byte first order.

       PseudoClass images (class=PseudoClass) are colormapped RGB images. The colormap is stored
       as a series of red, green, and blue pixel values, each value being a byte in size. If the
       image depth is 16, each colormap entry consumes two bytes with the most significant byte
       being first. The number of colormap entries is defined by the colors key.  The colormap
       data occurs immediately following the header (or image directory if the montage key is in
       the header). PseudoClass image data is an array of index values into the color map. If
       there are 256 or fewer colors in the image, each byte of image data contains an index
       value. If the image contains more than 256 colors or the image depth is 16, the index
       value is stored as two contiguous bytes with the most significant byte being first. If
       matte is true, each colormap index is followed by a 1 or 2-byte alpha value.

       The image data in a MIFF file may be uncompressed, runlength encoded, Zip compressed, or
       BZip compressed. The compression key in the header defines how the image data is com-
       pressed. Uncompressed pixels are just stored one scanline at a time in row order. Run-
       length encoded compression counts runs of identical adjacent pixels and stores the pixels
       followed by a length byte (the number of identical pixels minus 1). Zip and BZip compres-
       sion compresses each row of an image and preceeds the compressed row with the length of
       compressed pixel bytes as a word in most significant byte first order.

       MIFF files may contain more than one image.  Simply concatenate each individual image
       (composed of a header and image data) into one file.

SEE ALSO
       display(1), animate(1), import(1), montage(1), mogrify(1), convert(1), more(1), com-
       press(1)

COPYRIGHT
       Copyright (C) 2000 ImageMagick Studio, a non-profit organization dedicated to making soft-
       ware imaging solutions freely available.

       Permission is hereby granted, free of charge, to any person obtaining a copy of this soft-
       ware and associated documentation files ("ImageMagick"), to deal in ImageMagick without
       restriction, including without limitation the rights to use, copy, modify, merge, publish,
       distribute, sublicense, and/or sell copies of ImageMagick, and to permit persons to whom
       the ImageMagick is furnished to do so, subject to the following conditions:

       The above copyright notice and this permission notice shall be included in all copies or
       substantial portions of ImageMagick.

       The software is provided "as is", without warranty of any kind, express or implied,
       including but not limited to the warranties of merchantability, fitness for a particular
       purpose and noninfringement.  In no event shall ImageMagick Studio be liable for any
       claim, damages or other liability, whether in an action of contract, tort or otherwise,
       arising from, out of or in connection with ImageMagick or the use or other dealings in
       ImageMagick.

       Except as contained in this notice, the name of the ImageMagick Studio shall not be used
       in advertising or otherwise to promote the sale, use or other dealings in ImageMagick
       without prior written authorization from the ImageMagick Studio.

AUTHORS
       John Cristy, ImageMagick Studio

ImageMagick			   $Date: 2001/09/19 13:59:11 $ 			  MIFF(4)


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