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[clod]

Photoshop doesn't support embedding ICC profile to mono/duo/tri/quadtone images as these are defined as spots channels (even if you're only using process inks).Typical ICC profiles are utilizing process color look up tables. Since a duotone or quadtone can use inks other than process, embedding a profile isn't practical or logical. Now if Photoshop fully support N-color profiles, that would perhaps be a different story, but for now its CMYK only for ICC within Photoshop