PGX (JPEG 2000)
PGX is an uncompressed raster image file format used in JPEG 2000 conformance testing, and said to be used by the "JPEG 2000 Verification Model".
A PGX file stores only a single component, so it is limited to grayscale unless multiple PGX files are combined to make a color image.
PGX files begin with ASCII characters "
PG ML", or "
- ITU-T Rec. T.803, §B.2.6: Reference components file format