INGR --- Intergraph Raster Format

This format is supported for read and writes access.

The Intergraph Raster File Format was the native file format used by Intergraph software applications to store raster data. It is manifested in several internal data formats.

Reading INGR Files

Those are the data formats that the INGR driver supports for reading:

2 - Byte Integer
3 - Word Integer
4 - Integers 32 bit
5 - Floating Point 32 bit
6 - Floating Point 64 bit
9 - Run Length Encoded
10 - Run Length Encoded Color
24 - CCITT Group 4
27 - Adaptive RGB
28 - Uncompressed 24 bit
29 - Adaptive Gray Scale
30 - JPEG GRAY
31 - JPEG RGB
32 - JPEG CMYK
65 - Tiled
67 - Continuous Tone

The format "65 - Tiled" is not a format; it is just an indication that the file is tiled. In this case the tile header contains the real data format code that could be any of the above formats. The INGR driver can read tiled and untiled instance of any of the supported data formats.

Writing INGR Files

Those are the data formats that the INGR driver supports for writing:

2 - Byte Integer
3 - Word Integers
4 - Integers 32Bit
5 - Floating Point 32Bit
6 - Floating Point 64Bit

Type 9 RLE bitonal compression is used when outputting ".rle" file. Other file types are uncompressed.

Note that writing in that format is not encouraged.

File Extension

The following is a partial listing of INGR file extensions:

.cot

8-bit grayscale or color table data

.ctc

8-bit grayscale using PackBits-type compression (uncommon)

.rgb

24-bit color and grayscale (uncompressed and PackBits-type compression)

.ctb

8-bit color table data (uncompressed or run-length encoded)

.grd

8, 16 and 32 bit elevation data

.crl

8 or 16 bit, run-length compressed grayscale or color table data

.tpe

8 or 16 bit, run-length compressed grayscale or color table data

.lsr

8 or 16 bit, run-length compressed grayscale or color table data

.rle

1-bit run-length compressed data (16-bit runs)

.cit

CCITT G3 or G4 1-bit data

.g3

CCITT G3 1-bit data

.g4

CCITT G4 1-bit data

.tg4

CCITT G4 1-bit data (tiled)

.cmp

JPEG grayscale, RGB, or CMYK

.jpg

JPEG grayscale, RGB, or CMYK

Source: http://www.oreilly.com/www/centers/gff/formats/ingr/index.htm

The INGR driver does not require any especial file extension in order to identify or create an INGR file.

Georeference

The INGR driver does not support reading or writing georeference information. The reason for that is because there is no universal way of storing georeferencing in INGR files. It could have georeference stored in a accompanying .dgn file or in application specific data storage inside the file itself.

Metadata

The following creation option and bandset metadata is available.

RESOLUTION: This is the DPI (dots per inch). Microns not supported.