Hi,
you need to get rid of the exposure entry and the easiest way to do this is to apply ra_xyze -r -o also directly after pcompos.
Below an example script that works properly under linux.
hope that helps
Jan
hdrgen *.JPG -o unmodified.hdr -a -e -f -g
VIEW="-vta -vh 180 -vv 180"
ra_xyze -r -o unmodified.hdr
|pcompos -x $DIM_CROP -y $DIM_CROP -h - -$OFFSET_X -$OFFSET_Y
|ra_xyze -r -o
| pcomb -f …/fisheye_corr.cal -o -
| getinfo -a “VIEW= $VIEW”
| pcomb -f “…/vignetting_NIKON_SIGMA8_”$Aperture.cal -o - > uncalibrated.hdr