I fully understand that i need two seperations named as Colour A and Colour B - two plates. i'd prefer in certain areas of the image colours not to be mixed and in others be mixed. the duo tone curve is inadequate. now that i have seen it DCS looks better - but not knowing what it is hinders my efforts. so is it 'save as" .dcs ? and how compatible is it? it sounds like an image mode - "multi channel" and i have yet to save these without .psd as the extention.