Provided by: graphicsmagick_1.4+really1.3.42-1.1build3_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
ImageMagick $Date$ MIFF(4)