We, a printshop using offset and digital (HP-Indigo) presses, are using non-transpartant spot-colors like White or Foil. Indesign handles spot-colors as transparant. For normal inks, this is OK, but not for those mentioned, since these are opaque. I know the overprint-attribute does something almost similar, but it's not exactly the same.
So i need an option to define a spotcolor as 'Non-Transparent'.
It seems to me that for screen-printing this would also be a valuable option.
Robert Zegwaard commented
I found out that the ink-manager offers the posibility to set a spotcolor to opaque or opaque-ignore. This sounds good, but it only seems to affect the trapping :-(