If you create duotones with Adobe Photoshop 3.0 or 4.0 or any version of Corel PhotoPaint, you must save the duotones as separated DCS files. Saving as composite PostScript (EPS) will not preserve spot colors (that is, the image will be converted to process colors).
If you create duotones in Adobe Photoshop 5.0, you must save them using Adobe Photoshop 5.0.2. Photoshop 5.0 prevents duotones from working correctly on PostScript 3 devices. The free upgrade to Photoshop 5.0.2 is available for download from http://www.adobe.com/.
Saving duotones in Photoshop software
To save duotones in Photoshop, select Image > Mode > Multichannel. Then, save the file as DCS singles. Ensure that the image is not set to CMYK mode in Photoshop software. If the image is set to CMYK mode, spot colors are converted to process colors in Prinergy.
Saving duotones in layout software
You can output duotones (that were created in Adobe Photoshop 5.0.2 and saved as DCS files) from layout software as one of the following formats:
- Composite PostScript with OPI comments (composite thin PostScript). When Prinergy fattens the file, it creates a composite file.
- Separated PostScript with images (separated fat PostScript). Prinergy cannot perform trapping and color-handling functions on separated input files.