[AccessD] OT graphic PNM format to JPEG

OT 

Hi All:

Does anyone know of a application that will convert graphic PNM format to
JPEG format. 

As the PNM format is a rarely used format... (Still used in Linux.) It is
difficult to find a Windows converter that is not well priced. It is
unlikely that I will be using that conversion method on a regular base so I
am reluctant to invest.

MTIA
Jim