Provided by: graphicsmagick_1.3.18-1ubuntu3.1_amd64 
NAME
MIFF - Magick Image File Format
SYNOPSIS
#include <image.h>
DESCRIPTION
The Magick Image File Format (MIFF) 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.).
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
whitespace 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
character. 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
background, 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=RLE compression=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
profile is defined by the ICC profile specification located at
ftp://sgigate.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
resolution 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
contents. 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
directory 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
compressed. Uncompressed pixels are just stored one scanline at a time in row order.
Runlength 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
compression 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),
compress(1)
COPYRIGHT
Copyright (C) 2000 ImageMagick Studio, a non-profit organization dedicated to making
software imaging solutions freely available.
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software 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