Intergraph Raster Image

Writable

image

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Identify it

Extensions	`.cot.cit.rle.rgb.ing.cmp.crl.ctb.ctc.g3.g4.grd.itg.jpg.lsr.t27.t29.tg4.tpe`
PRONOM	`x-fmt/229`
Wikidata	`Q28206359`

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Open it

ImageMagickOpen sourcereads and writes · ImageMagick License
DIAdemwrites
Zoner Photo Studioreads and writes
ArcGISreads · proprietary license
Hijaak Digital Photo Studioreads
Image Alchemyreads

Convert it

To	With	Fidelity	Command and losses
Portable Network Graphics	ImageMagick	Lossless	`convert in.g4 out.png` Pixels kept; some metadata, colour profiles or layers may be dropped.
Tagged Image File Format	ImageMagick	Lossless	`convert in.g4 out.tif` Pixels kept; some metadata, colour profiles or layers may be dropped.
GIF 89a	ImageMagick	Lossy	`convert in.g4 out.gif` Reduced to 256 colours.
JPEG File Interchange Format 1.02	ImageMagick	Lossy	`convert in.g4 out.jpg` Lossy compression.
WebP	ImageMagick	Lossy	`convert in.g4 out.webp` Lossy compression.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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