file/Magdir/images

#------------------------------------------------------------------------------
# images:  file(1) magic for image formats (see also "iff")
#
# originally from jef@helios.ee.lbl.gov (Jef Poskanzer),
# additions by janl@ifi.uio.no as well as others. Jan also suggested
# merging several one- and two-line files into here.
#
# little magic: PCX (first byte is 0x0a)
# no magic: Targa

# PBMPLUS images
# The next byte following the magic is always whitespace.
0	string		P1		PBM image text
0	string		P2		PGM image text
0	string		P3		PPM image text
0	string		P4		PBM "rawbits" image data
0	string		P5		PGM "rawbits" image data
0	string		P6		PPM "rawbits" image data

# NIFF (Navy Interchange File Format, a modification of TIFF) images
0	string		IIN1		NIFF image data

# Tag Image File Format, from Daniel Quinlan (quinlan@yggdrasil.com)
# The second word of TIFF files is the TIFF version number, 42, which has
# never changed.  The TIFF specification recommends testing for it.
0	string		MM\x00\x2a	TIFF image data, big-endian
0	string		II\x2a\x00	TIFF image data, little-endian

# PNG [Portable Network Graphics, or "PNG's Not GIF"] images
# (Greg Roelofs, newt@uchicago.edu)
# (Albert Cahalan, acahalan@cs.uml.edu)
# 137 P N G \r \n ^Z \n [4-byte length] H E A D [HEAD data] [HEAD crc] ...
#
0	string		\x89PNG		PNG image data,
>4	belong		!0x0d0a1a0a	CORRUPTED
>4	belong		0x0d0a1a0a
>>16	belong		x		%ld x
>>20	belong		x		%ld,
>>24	byte		x		%d-bit
>>25	byte		0		grayscale,
>>25	byte		2		\b/color RGB,
>>25	byte		3		colormap,
>>25	byte		4		gray+alpha,
>>25	byte		6		\b/color RGBA,
#>>26	byte		0		deflate/32K,
>>28	byte		0		non-interlaced
>>28	byte		1		interlaced
1	string		PNG		PNG image data, CORRUPTED

# GIF
0	string		GIF8		GIF image data
>4	string		7a		\b, version 8%s,
>4	string		9a		\b, version 8%s,
>6	leshort		>0		%hd x
>8	leshort		>0		%hd,
#>10	byte		&0x80		color mapped,
#>10	byte&0x07	=0x00		2 colors
#>10	byte&0x07	=0x01		4 colors
#>10	byte&0x07	=0x02		8 colors
#>10	byte&0x07	=0x03		16 colors
#>10	byte&0x07	=0x04		32 colors
#>10	byte&0x07	=0x05		64 colors
#>10	byte&0x07	=0x06		128 colors
#>10	byte&0x07	=0x07		256 colors

# ITC (CMU WM) raster files.  It is essentially a byte-reversed Sun raster,
# 1 plane, no encoding.
0	string		\361\0\100\273	CMU window manager raster image data
>4	lelong		>0		%d x
>8	lelong		>0		%d,
>12	lelong		>0		%d-bit

# Magick Image File Format
0	string		id=ImageMagick	MIFF image data

# Artisan
0	long		1123028772	Artisan image data
>4	long		1		\b, rectangular 24-bit
>4	long		2		\b, rectangular 8-bit with colormap
>4	long		3		\b, rectangular 32-bit (24-bit with matte)

# FIG (Facility for Interactive Generation of figures), an object-based format
0	string		#FIG		FIG image text
>5	string		x		\b, version %.3s

# PHIGS
0	string		ARF_BEGARF		PHIGS clear text archive
0	string		@(#)SunPHIGS		SunPHIGS
# version number follows, in the form m.n
>40	string		SunBin			binary
>32	string		archive			archive

# GKS (Graphics Kernel System)
0	string		GKSM		GKS Metafile
>24	string		SunGKS		\b, SunGKS

# CGM image files
0	string		BEGMF		clear text Computer Graphics Metafile
# XXX - questionable magic
0	beshort&0xffe0	0x0020		binary Computer Graphics Metafile
0	beshort		0x3020		character Computer Graphics Metafile

# MGR bitmaps  (Michael Haardt, u31b3hs@pool.informatik.rwth-aachen.de)
0	string	yz	MGR bitmap, modern format, 8-bit aligned
0	string	zz	MGR bitmap, old format, 1-bit deep, 16-bit aligned
0	string	xz	MGR bitmap, old format, 1-bit deep, 32-bit aligned
0	string	yx	MGR bitmap, modern format, squeezed

# Fuzzy Bitmap (FBM) images
0	string		%bitmap\0	FBM image data
>30	long		0x31		\b, mono
>30	long		0x33		\b, color

# facsimile data
1	string		PC\ Research,\ Inc	group 3 fax data
>29	byte		0		\b, normal resolution (204x98 DPI)
>29	byte		1		\b, fine resolution (204x196 DPI)

# JPEG images
0	beshort		0xffd8		JPEG image data
>6	string		JFIF		\b, JFIF standard
# HSI is Handmade Software's proprietary JPEG encoding scheme
0	string		hsi1		JPEG image data, HSI proprietary

# PC bitmaps (OS/2, Windoze BMP files)  (Greg Roelofs, newt@uchicago.edu)
0	string		BM		PC bitmap data
>14	leshort		12		\b, OS/2 1.x format
>>18	leshort		x		\b, %d x
>>20	leshort		x		%d
>14	leshort		64		\b, OS/2 2.x format
>>18	leshort		x		\b, %d x
>>20	leshort		x		%d
>14	leshort		40		\b, Windows 3.x format
>>18	lelong		x		\b, %d x
>>22	lelong		x		%d x
>>28	leshort		x		%d
0	string		IC		PC icon data
0	string		PI		PC pointer image data
0	string		CI		PC color icon data
0	string		CP		PC color pointer image data
# Conflicts with other entries [BABYL]
#0	string		BA		PC bitmap array data

# XPM icons (Greg Roelofs, newt@uchicago.edu)
# note possible collision with C/REXX entry in c-lang; currently commented out
0	string		/*\ XPM\ */	X pixmap image text

# Utah Raster Toolkit RLE images (janl@ifi.uio.no)
0	leshort		0xcc52		RLE image data,
>6	leshort		x		%d x
>8	leshort		x		%d
>2	leshort		>0		\b, lower left corner: %d
>4	leshort		>0		\b, lower right corner: %d
>10	byte&0x1	=0x1		\b, clear first
>10	byte&0x2	=0x2		\b, no background
>10	byte&0x4	=0x4		\b, alpha channel
>10	byte&0x8	=0x8		\b, comment
>11	byte		>0		\b, %d color channels
>12	byte		>0		\b, %d bits per pixel
>13	byte		>0		\b, %d color map channels

# image file format (Robert Potter, potter@cs.rochester.edu)
0	string		Imagefile\ version-	iff image data
# this adds the whole header (inc. version number), informative but longish
>10	string		>\0		%s

# Sun raster images, from Daniel Quinlan (quinlan@yggdrasil.com)
0	belong		0x59a66a95	Sun raster image data
>4	belong		>0		\b, %d x
>8	belong		>0		%d,
>12	belong		>0		%d-bit,
#>16	belong		>0		%d bytes long,
>20	belong		0		old format,
#>20	belong		1		standard,
>20	belong		2		compressed,
>20	belong		3		RGB,
>20	belong		4		TIFF,
>20	belong		5		IFF,
>20	belong		0xffff		reserved for testing,
>24	belong		0		no colormap
>24	belong		1		RGB colormap
>24	belong		2		raw colormap
#>28	belong		>0		colormap is %d bytes long

# SGI image file format, from Daniel Quinlan (quinlan@yggdrasil.com)
# file://sgi.com/graphics/SGIIMAGESPEC
0	beshort		474		SGI image data
#>2	byte		0		\b, verbatim
>2	byte		1		\b, RLE
#>3	byte		1		\b, normal precision
>3	byte		2		\b, high precision
>4	beshort		x		\b, %d-D
>6	beshort		x		\b, %d x
>8	beshort		x		%d
>10	beshort		x		\b, %d channel
>10	beshort		!1		\bs
>80	string		>0		\b, "%s"

0	string		IT01		FIT image data
>4	belong		x		\b, %d x
>8	belong		x		%d x
>12	belong		x		%d
#
0	string		IT02		FIT image data
>4	belong		x		\b, %d x
>8	belong		x		%d x
>12	belong		x		%d
#
2048	string		PCD_IPI		Kodak Photo CD image pack file
0	string		PCD_OPA		Kodak Photo CD overview pack file

# FITS format.  Jeff Uphoff <juphoff@tarsier.cv.nrao.edu>
# FITS is the Flexible Image Transport System, the de facto standard for
# data and image transfer, storage, etc., for the astronomical community.
# (FITS floating point formats are big-endian.)
0	string	SIMPLE\ \ =	FITS image data
>109	string	8		\b, 8-bit, character or unsigned binary integer
>108	string	16		\b, 16-bit, two's complement binary integer
>107	string	\ 32		\b, 32-bit, two's complement binary integer
>107	string	-32		\b, 32-bit, floating point, single precision
>107	string	-64		\b, 64-bit, floating point, double precision

# other images
0	string	This\ is\ a\ BitMap\ file	Lisp Machine bit-array-file
0	string		!!		Bennet Yee's "face" format