Parent Topic: Supported File Formats

PPM/PGM/PBM (PPM)

Raw PPM, PGM, and PBM files are simple raster formats supported by the GeoGateway library. ASCII formatted PPM, PGM, and PBM files are not supported. These files are an interchange format used by the popular `pbmplus' file interchange utilities.

PPM: RGB format, only 24-bit supported.
PGM: Greyscale, only 8-bit supported.
PBM: Bitmap, all supported.

PPM, PGM, and PBM files have no auxiliary information such as georeferencing, LUTs, or PCTs; however, georeferencing will be exported in an .aux file.

These formats are supported for read, write, and update. The PPM and PGM files can be accessed with the LINK program.

Export of PPM files is supported. These files are exported with a type of "PPM".

The provided data must match one of these three configurations:

1 Channel: PGM Greyscale.
3 Channels: PPM RGB.
1 Bitmap: PBM Bitmap.

Georeferencing information will be placed in an ``.aux'' file in the same directory.