When I take an EXR image rendered by blender and use imagemagick to convert it into a PNG
convert /var/tmp/blender/easter-eggs/vr360/0007.exr /tmp/x
the resulting image is rather dark. I have to use the -modulate option like
convert /var/tmp/blender/easter-eggs/vr360/0007.exr -modulate 200 /tmp/x.png
and even then looking at the PNG in gimp doesn't look the same as if I load the .EXR in blender's UV/Image editor.
Why do these two pieces of software disagree on how to interpret the values in the .EXR file, and what workflow should I use to convert .EXR to PNG on the command line?