How do I print Duotone separatipons for screen printing?

[waters_tc]

I've made a duotone image that looks great, but I don't see a way to print the two colors (well one color and also black) as separate files.  When I do a CMYK separation, I get the four channels and can print each one separately.  I don't see a way to do that for duotone.

THX

[Norman Sanders · Accepted solution]

The Channels panel currently shows the duotone in a single channel. The next steps, made by you or your suppier, will separate the colors. If you prefer to have the supplier do the job, save the file in Photoshop (psd) format.
Otherwise:

1. Image > Mode > Multichannel (Note the two channels in the Channels panel.)
2. File > Save as… In the Format field choose Photoshop DCS 2.0

A reminder: Check with the screener regarding file resolution and other limitations since screen printing usually involves opaque inks and may have special additional specifications.  (Also, consider posterizing the image a duotone proves impractical.)