where to get GretagMacbeth ColorCheck/ColorChecker DC/ with Readings?

Please kindly reply!

Professional photographic stores have them--they're a printing tool--or you can mail-order them. Where are you in the world are you?

Hey, Greg, have you considered adding ICC color profile support to some Radiance components, perhaps the PNG image conversion program? That would allow Radiance users to make use of the tools that the various commerical graphic arts software people have developed; MacOS X and some Windows users would--if their systems were properly set up--get the ability to print color predictably. (Not sure if there's direct PostScript support for ICC color profiles.)