[NTG-context] ConTeXt and duotone graphics

Hello list, I have just came across this little script which allows to create duotone pdfs with DeviceN channel. The script takes two grayscale tifs as arguments and returns a pdf duotone. I guess it shouldn't be too difficult to include it in the ConTeXt processing chain. Probably one could include a command in a source file which would reference both files used for creation of a duotone image and the resulting image would be used in the final pdf. How would you go about implementing such a coupling? Here is the link to the script http://stdin.fr/Bazar/SpotColorImages Best Piotr -- http://okle.pl