PlugSPOTin, an add-on module for Asura and Solvero, can convert RGB, CMYK or Lab colors into pre-defined or custom colors. PlugSPOTin enables you to convert four-color documents efficiently into spot-color documents (e.g. 2C), can process images for conversion to colorized grayscales, or change process color blends into spot color blends.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.