Check the exposure settings: both, the ev value of the input image and
the output exposure value (on the fast preview) should be the same
value. Try best with both values set to zero.

> I am trying to use nona via commandline to process a rectilinear 2:1
> spherical image in either .hdr of .tff 32bits FLOAT and extract cubic
> faces in either .hdr or .tiff 32bits FLOAT.  I can create the cubic
> files but the dynamic range seems to have shifted or reduced somewhat,
> by this i mean when adjusting the exposure in a viewer the darker
> areas of the image have lost their range and become grey compared to
> the source file that has more range all the way down to the all black
> level.  Is there a setting in nona to maintain the dynamic range of
> the source image?

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