NIST IHead - Revision history

Marco at 15:20, 22 February 2016

2016-02-22T15:20:18Z

Jsummers: Category:Forensics and Law Enforcement

2016-01-02T20:55:40Z

Category:Forensics and Law Enforcement

Jsummers at 00:29, 13 August 2014

2014-08-13T00:29:35Z

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|pct}} |released=≤1991 }} '''NIST IHead''' format (sometimes called '''IHDR''') is a raster graphics fo..."

2014-08-13T00:28:31Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|pct}} |released=≤1991 }} '''NIST IHead''' format (sometimes called '''IHDR''') is a raster graphics fo..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|pct}}
|released=≤1991
}}
'''NIST IHead''' format (sometimes called '''IHDR''') is a raster graphics format associated with some image databases published by NIST (National Institute of Standards and Technology). The databases are not generally available for free, but some sample files are.

IHead is not a very complex format, and it seems to be adequately documentated. But it is still confusing, because every NIST database uses a different variant of it, and because everything associated with these databases seems to have multiple names.

The image may uncompressed, or use one of many compression algorithms. Compression code 0 means uncompressed, 2 is [[CCITT Group 4]], and 6 is modified [[Lossless JPEG (original)|Lossless JPEG]].

== Identification ==
Some or all files begin with ASCII "<code>288</code>", followed by five <code>0x00</code> bytes. This is a decimal representation of the header size.

== Software ==
* [[XnView]]
* The NIST databases and samples may include software (C source code) to read the format used in that database. For example, [ftp://sequoyah.ncsl.nist.gov/pub/databases/data/prints4.tar.Z prints4.tar.Z] includes an ihdr2sun.c file to convert to [[Sun Raster]] format.

== Sample files ==
* Some of the files at ftp://sequoyah.ncsl.nist.gov/pub/databases/data/, such as [ftp://sequoyah.ncsl.nist.gov/pub/databases/data/prints4.tar.Z prints4.tar.Z]

== Links ==
* [http://www.nist.gov/srd/nistsd4.cfm NIST Special Database 4]
** [ftp://sequoyah.ncsl.nist.gov/pub/databases/data/prints4.txt prints4.txt] - Information about NIST Special Database 4 - Fingerprint Samples
* [http://www.nist.gov/srd/nistsd14.cfm NIST Special Database 14]
** [ftp://sequoyah.ncsl.nist.gov/pub/databases/data/prints14.txt prints14.txt] - Information about Image Samples from NIST Special Database 14
* [http://www.nist.gov/srd/upload/nistsp2.pdf NIST Imaging Database 2 - Structured Forms Database Users' Guide (NIST Special Database 2)], §2.2: Image File Format
* [http://www.nist.gov/srd/upload/Spec-db-4-2.pdf NIST Imaging Database 4 - Fingerprint Database (NIST Special Database 4)]
* [http://www.nist.gov/srd/upload/Spec-db-6.pdf NIST Imaging Database 2 - Structured Forms Database Users' Guide (NIST Special Database 6)]

← Older revision		Revision as of 20:55, 2 January 2016
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	* [http://www.nist.gov/srd/upload/Spec-db-4-2.pdf NIST Imaging Database 4 - Fingerprint Database (NIST Special Database 4)]		* [http://www.nist.gov/srd/upload/Spec-db-4-2.pdf NIST Imaging Database 4 - Fingerprint Database (NIST Special Database 4)]
	* [http://www.nist.gov/srd/upload/Spec-db-6.pdf NIST Imaging Database 2 - Structured Forms Database Users' Guide (NIST Special Database 6)]		* [http://www.nist.gov/srd/upload/Spec-db-6.pdf NIST Imaging Database 2 - Structured Forms Database Users' Guide (NIST Special Database 6)]
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		+	[[Category:Forensics and Law Enforcement]]

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 == Software ==
 * [[XnView]]
 * The NIST databases and samples may include software (C source code) to read the format used in that database. For example, [ftp://sequoyah.ncsl.nist.gov/pub/databases/data/prints4.tar.Z prints4.tar.Z] includes an ihdr2sun.c file to convert to [[Sun Raster]] format.

@@ Line 7: / Line 7: @@
 '''NIST IHead''' format (sometimes called '''IHDR''') is a raster graphics format associated with some image databases published by NIST (National Institute of Standards and Technology). The databases are not generally available for free, but some sample files are.
-IHead is not a very complex format, and it seems to be adequately documentated. But it is still confusing, because every NIST database uses a different variant of it, and because everything associated with these databases seems to have multiple names.
+IHead is not a very complex format, and it seems to be adequately documented. But it is still confusing, because every NIST database uses a different variant of it, and because everything associated with these databases seems to have multiple names.
 The image may uncompressed, or use one of many compression algorithms. Compression code 0 means uncompressed, 2 is [[CCITT Group 4]], and 6 is modified [[Lossless JPEG (original)|Lossless JPEG]].