isis2fits -- 32bit conversion passes bzero and bscale through even though it's not necessary
Posted on the ISIS Support board. https://isis.astrogeology.usgs.gov/IsisSupport/index.php/topic,3935.0.html
I'm converting .cub images in FITS format using isis2fits.
I'm using ISIS 18.104.22.16877.
When converting scaled 8 or 16bit data (with Base and Multiplier different from 0 and 1) to scaled FITS without stretch, I'm expecting same pixel values and BZERO(=Base) and BSCALE(=Multiplier) FITS keywords. BZERO and BSCALE are ok,
but dynamics is completely lost (all pixel values are compressed around Base value). To temporally solve the problem I have exported cub in 32bit, but BZERO and BSCALE are still there and I have to modified them by hand (BZERO=0 and BSCALE=1) to display good pixel values.
isis2fits should not pass the bzero and bscale values to the FITS header when converting 32bit data.