Great question! The Auto Color Adjuster does actually work with a source ICC profile. In the scenario you described, where a customer brings a printed sample, the Auto Color Adjuster uses a function called Color Sample Matching. Here’s how it works:
You scan the provided sample using the Auto Color Adjuster hardware. The software then creates a simulation profile based on that scan, which becomes your source profile.
This approach ensures the output closely matches the original sample, even when the original ICC profile isn’t available.