Currently, the only two TIFF formats supported in "Save as HDR" are 32bit and 16bit (logluv) floating point. These files are not handled properly by ImageMagick (I tried the most recent source version, 6.5.8-10), even whet it is compiled with HDRI and Q32 options.
Ideally, I'd like to see Luminance being able to write HDR files in 16bit integer TIFF format, which can be handled by ImageMagick. To minimize the loss of precision, the HDR image needs to be normalized (with the max value being 65535).
Thank you in advance.