  We propose an efficient framework of reversible data hiding to preserve
compatibility between normal printing and printing with a special color ink by
using a single common image. The special color layer is converted to a binary
image by digital halftoning and losslessly compressed using JBIG2. Then, the
compressed information of the binarized special color layer is reversibly
embedded into the general color layer without significant distortion. Our
experimental results show the availability of the proposed method in terms of
the marked image quality.
