With Prinergy OPI, you can include the spot color information contained in the channels of TIFF images.
Note: If the images are not Photoshop TIFF files, Prinergy ignores spot color channels during OPI. Save the images as DCS files and replace them in the original layout.
The InDesign software does not omit TIFF files for OPI-containing spot colors, even when OPI is selected in the Print dialog box. Create a plain CMYK image as a proxy, print the PostScript, including the OPI comments but omitting images, and then add the TIFF file containing the desired spot color channels into an OPI search path location in the Prinergy software.
The Prinergy software merges the CMYK color channels with all spot color channels to produce a single, multi-channel (DeviceN) image.