View source for Intergraph Raster

{{FormatInfo
|formattype=electronic
|subcat=Geospatial
|extensions={{ext|cot}}, {{ext|cit}}, {{ext|rle}}, {{ext|rgb}}, others
|pronom={{PRONOM|x-fmt/229}}
|released=~1986
}}
'''Intergraph Raster''' ('''INGR''') is a raster graphics format associated with geospatial products from Intergraph.

Some sources mention a bi-level format named '''Intergraph File Format''', '''Intergraph''', '''IntergraphRLE''', or '''ITG'''. It's not clear whether this refers to a particular type of INGR file, or to an entirely different file format.

Intergraph Raster is apparently distinct from [[Intergraph Standard File Formats]] (ISFF) [http://dgnlib.maptools.org/dgn.html].

== Identifiers ==
One source gives the following "partial listing" of INGR file extensions: '''.cot''', '''.ctc''', '''.rgb''', '''.ctb''', '''.grd''', '''.crl''', '''.tpe''', '''.lsr''', '''.rle''', '''.cit''', '''.g3''', '''.g4''', '''.tg4''', '''.cmp''', '''.jpg'''.

[[XnView]] also gives '''.itg'''.

LEADTOOLS also gives '''.t27''', '''.t29'''.

[[PRONOM]] gives '''.ing'''.

== Identification ==
The documentation implies that all INGR files begin with {{magic|0x08 0x09}}.

== Specifications ==
* [https://web.archive.org/web/20140903185431/http://oreilly.com/www/centers/gff/formats/ingr/index.htm Intergraph Raster File Format] (from archive.org)
* ''Intergraph Raster File Format Reference'' (formerly at <nowiki>ftp://ftp.intergraph.com/pub/bbs/scan/note/rffrgps.zip</nowiki>)

== Software ==
* [http://www.gdal.org/ GDAL]
* [[XnView]]
* [[Image Alchemy]]

Note that GDAL has removed support for this format in recent versions.

One way to get a version of GDAL which still has support, is to install FreeBSD 13.1-RELEASE from the DVD image and install the binary GDAL 3.4.2 package from the DVD.

== Links ==
* [http://www.gdal.org/frmt_intergraphraster.html GDAL: Intergraph Raster Format]
* [https://www.leadtools.com/help/leadtools/v19/main/api/itgfmt.html LEADTOOLS: IntergraphRLE and Intergraph Raster File Formats]
* [[Wikipedia: Intergraph]]

[[Category:Graphics]]
[[Category:File formats with too many extensions]]