Duotone image problem, for some reason it still has 5 channels

Question

I need to print a duotone image. I made the file grayscale, then duotone, black and 100%cyan. But for some reason the file still has all CMYK channels and an extra black channel after exporting, which is screwing up the printing. I've retried several times and can't make it work. How do I get rid of them?

Josef31698074iy7y · Accepted Answer

I (FINALLY) found a solution. I made the duotone image into CMYK and then I just deleted the M+Y channels in the printer driver. (It was pretty much just the fifth black channel that was causing the problem)

Stephen Marsh · Answer

Although you found "an answer" – it isn't "the answer".

https://helpx.adobe.com/photoshop/using/duotones.html#exporting_duotone_images_to_other_applications

Duotone mode is a very special colour mode with restricted output format requirements:

Photoshop:

Software such as Adobe InDesign can correctly recognise the spot channels in PSD, Photoshop PDF, or the old legacy EPS format.

InDesign:

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