FME can access data in the CALS format.
In general, a CALS raster is an efficient way to store a purely black-and-white raster while retaining orientation metadata.
A CALS Type 1 raster is black-and-white with a bit-depth of 1. A CALS raster is defined by a 2048-byte header, as described in MIL-STD-1840.
The CALS dataset is exposed as a raster with a 2-entry palette, with 0 mapped to white (RGB=255,255,255) and 1 mapped to black (RGB=0,0,0).
FME Raster Features
FME raster features represent raster data and use several concepts that are unlike those used in the handling of vector data.
For comprehensive information about how FME processes raster data, see Rasters.