Unfortunately we can't simply add -dUseCIEColor to the 'PDFSETTINGS' (as has been suggested previously) because the PDFSETTINGS are a collection of distiller parameters, and UseCIEColor is a PostScript parameter.
I still hope to get proper colour management for pdfwrite into the next release, and the requirement to add -dUseCIEColor to the command line should go away at that time.
Unfortunately we can't simply add -dUseCIEColor to the 'PDFSETTINGS' (as has been suggested previously) because the PDFSETTINGS are a collection of distiller parameters, and UseCIEColor is a PostScript parameter.
I still hope to get proper colour management for pdfwrite into the next release, and the requirement to add -dUseCIEColor to the command line should go away at that time.