CIT to TIFF Converter

CIT to TIFF Conversion Explained

Converting .CIT (Intergraph Raster) to .TIFF (Tagged Image File Format) changes a proprietary, legacy CAD and GIS image format into a universally supported raster format.

People convert .CIT to .TIFF because .CIT is an old, 1-bit (bi-level) format originally designed for scanned engineering drawings and maps in Intergraph and Bentley systems. Modern software often cannot read it. By converting to .TIFF, users gain universal compatibility across almost all image viewers, GIS platforms, and document management systems.

Because both formats natively support CCITT Group 4 compression for 1-bit monochrome data, the image data transfers losslessly. The main trade-off is spatial metadata. .CIT files often contain proprietary Intergraph georeferencing headers. If you convert to a standard .TIFF without generating a TIFF World File (.TFW) or writing to a GeoTIFF, you will lose the spatial alignment of the map or drawing.

Typical Tasks and Users

• GIS Professionals: Migrating legacy Intergraph GeoMedia or MicroStation spatial data to modern GIS platforms like ArcGIS or QGIS.
• Civil Engineers & Architects: Archiving old scanned blueprints, schematics, and parcel maps into a standard, future-proof format.
• Archivists: Converting proprietary 1-bit scans into standard .TIFF files for long-term digital preservation, as .TIFF is the archival gold standard.

Software & Tool Support

• Bentley MicroStation: Offers native support for .CIT files and can export or print them to .TIFF.
• Hexagon GeoMedia: Hexagon provides the Intergraph Standard Raster Utilities (ISRU), a command-line toolset that can convert .CIT to .TIFF and generate world files.
• FME by Safe Software: An enterprise spatial data converter that handles Intergraph Raster to GeoTIFF conversions.
• GDAL: The open-source Geospatial Data Abstraction Library supported the INGR (Intergraph Raster) format in older versions. However, native support was deprecated and removed in recent builds (v3.5+), making modern open-source conversion difficult.
• reaConverter: A commercial Windows desktop application that supports batch conversion of .CIT files.

Pros and Cons of the Conversion

• Pros:

  • Universal Compatibility: .TIFF is supported by every major operating system, CAD program, and GIS tool.
  • Lossless Transfer: Both formats use CCITT Group 4 compression. The 1-bit black-and-white pixel data remains mathematically identical.
  • File Size Efficiency: Because the compression method remains the same, the resulting .TIFF file stays extremely small.

• Cons:

  • Georeferencing Loss: Standard .TIFF does not store spatial data. You must explicitly convert to GeoTIFF or extract a .TFW file to keep maps aligned.
  • Broken Legacy Workflows: If an older MicroStation project file strictly references a .CIT file path, replacing it with a .TIFF will break the reference link.

Conversion Difficulties & Why Convert.Guru

The primary technical problem when you convert cit to tiff is handling the 1-bit color space and the spatial metadata. Poorly configured converters often rasterize the 1-bit .CIT file into an 8-bit grayscale or 24-bit RGB .TIFF. This does not improve image quality, but it inflates the file size by 8x to 24x. Furthermore, with the removal of INGR support from modern GDAL libraries, finding reliable, free command-line tools to process these files has become a major hurdle.

Convert.Guru is a strong choice for this conversion because it correctly identifies the 1-bit bi-level nature of the .CIT file. It maps the data directly to a CCITT Group 4 compressed .TIFF, ensuring the output remains crisp, lightweight, and structurally identical to the original scan, without requiring access to expensive legacy CAD software.

CIT vs. TIFF: What is the better choice?

Which format should you choose?

Choose .CIT only if you are actively working in an older version of Bentley MicroStation or Intergraph GeoMedia where existing project files strictly require the .CIT extension to function.

Choose .TIFF for all other use cases. It is the superior choice for sharing, archiving, and importing scanned engineering drawings into modern systems.

Avoid this conversion entirely if you need editable vector data. Both .CIT and .TIFF are raster (pixel-based) formats. If you need editable CAD lines, you must use raster-to-vector (R2V) software to trace the pixels and export to .DXF or .DWG instead.

Conclusion

Converting .CIT to .TIFF is a highly practical and necessary step for modernizing legacy engineering and GIS archives. Because both formats utilize CCITT Group 4 compression, the conversion is perfectly lossless, preserving the crisp 1-bit line work of the original scans without inflating file sizes. The biggest limitation to watch for is the potential loss of spatial coordinates; users must ensure their conversion method supports GeoTIFF or world files if the images are georeferenced maps. For users who lack access to legacy Intergraph software or older versions of GDAL, Convert.Guru provides a reliable, zero-configuration tool to perform this exact conversion accurately.