I just got my renderer where I wanted so I will start outputting hdr. The simple library I talked about in an earlier post has a minimal but sweet interface for dealing with Radiance .rgbe/.hdr files. This appears to work fine (reading in a pgm into floats and then cranking them up X10). Question: on OSX what do people use to view Radiance image files? I downloaded ximage for OSX but it needs x windows and I am trying to avoid installing X for no good reason (maybe just one of these moments I experience with perfectly good things like X). Edit: I knuckled under and put X on my mac. Running ximage from xterm works great. ximage stands up well for its age! The stb_image* support for HDR seems to work perfectly!