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.

Identification
PGX files begin with ASCII characters " ", or " ".

Specifications

 * ITU-T Rec. T.803, §B.2.6: Reference components file format

Software

 * Konvertor
 * OpenJPEG -  can convert PGX to JP2
 * JasPer
 * Rest7 Online Image Converter

Sample files

 * https://github.com/uclouvain/openjpeg-data/tree/master/baseline ...