That is literally the exact thing I was looking for - embarrassing that it was so simple!
Many thanks for your time.
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ImageMagick 7.0.8-26 Q16 x86_64 2019-02-09 (but happy to use any version) Please see the example Butterfly image here (I have added both a RGB .png file and a CMYK .tif file): https://www.dropbox.com/sh/lfhwwep2f29xi99/AAAIkAkmSx9lnoVN7I8GNcfua?dl=0 What I am trying to do is keep the white whilst pr...