PDF: Trying to output a Duotone PDF with 'tiffsep' does not create a spot color file (although the color is identified to StdErr). To test I placed this same file into another document with CMYK components and additional spot colors and found that whatever the last identified color is will not be output. (Using InDesign I had an overall background color which was listed first, the Duotone, which came second, and two different spots from another placed PDF file which were last. The very last color did not output a separation.) PS: If I use a PS file as the input (converting the pdf with Acrobat 8) it creates the separation files for all spot colors, but the channel with the duotone image data is blank. Output to 'psdcmyk' has the same results, missing (or blank) channel in the resulting file.
Created attachment 3958 [details] DuotoneWithSpottest This is the test file I used to work on this issue. CMYK+4 spots.
Current development version of Ghostscript has tiffsep device working correctly in 64-bit builds. 32-bit build has some problems, which are tracked in the bug 692318. *** This bug has been marked as a duplicate of bug 692318 ***