I have been working on a series of brochures, have created 5 so far, each with a duotone image. They would always be in color when viewing the whole document in Acrobat.
Today, I'm working on the last brochure, and somehow that duotone image is showing in black and white in Acrobat. Any clue why?
I worked from a jpeg, converted to Grayscale, then to Duotone with a CMYK value (100-75-10-0) and white. Seems like it worked fine before. I'm attaching an image which shows the previous brochure in PDF, and to the left, the current one with the issue.
Have you verified in Acrobat's ink manager that its actualyl seeing your custom channels/ plates? If not, that could be the problem and you need to find out why your custom color is lost...