There used to be a Photoshop plugin that would separate a full-color RGB/CMYK image into spot colors appropriately (or inappropriately, as the case may be) - for example, a predominantly tan and blue image of a person standing in water to just those spot colors. I think it made the images into DCS multichannel files ... anyway, is there anything like that for CS4? Or is there a relatively easy way to do it manually?
When I build a spot gradient in Indesign or Illustrator I'm not getting exactly what I want. What I want: a very dark blue (say, PMS 2756) to black - with the blue getting darker and darker toward black. What I get on screen and on proof: the blue becoming a lighter gray, then the gray darkening toward black. I assume the solution rests in using a blue > nothing gradient in a layer above a blue > black and messing with overprinting / transparency but I'm unsure how to proceed. Any advice?