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I've fixed the problem, seemingly by chance. I went into the RAW/FITS digital development settings menu in DSS. I'd tried everything in the RAW tab to no avail, but this time I went to the FITS tab (I never go near FITS - I take CR2 raw files, stack them in DSS and output as 32-bit TIFF) and checked the "Monochrome 16-bit FITS files are RAW files created by a DSLR" box and - hey presto! - the colour gradient vanished.
Grant, try this and restock the image with red and green corners and see ifet works for you.
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