What is a .CPT file?
CPT is a colour-palette file used by GMT and GDAL to colour maps.
- Did you know
- A CPT maps data values to colours, for example shading elevation on a map.
- CPT comes from the Generic Mapping Tools suite created by Paul Wessel and Walter Smith for scientific cartography.
- A palette can be discrete, giving each band a flat colour, or continuous, blending smoothly between defined data values.
- What Analyser reads
- Identify and read more GIS and mapping files: OpenStreetMap o5m/o5c binaries, Esri layer files (.lyrx ArcGIS Pro CIM JSON, .lyr ArcMap), QGIS projects (.qgs/.qgz - version, CRS, layer list), shapefile spatial indexes (.sbn/.sbx), GMT/GDAL colour palettes (.cpt) and ENVI band-interleaved rasters (.bil/.bip/.bsq).
- Depth of analysis
- .CPT is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .CPT file
- Drag a .CPT file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.