Epson Proo?ng Edition Series Reference Manual page 10

Optimize Any Input-to-Output ICC Workflow to Extreme Color Accuracy
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For extreme color accuracy, EFI has fully implemented the use of 3CC files
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Aggressive new math is now used to optimized the overall workflow to exacting standards
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Capable of reducing overall delta-E to levels of accuracy previously not possible
Automatic Creation of Advanced Three-Dimensional Color Correction Files (.3CC)
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Using the optional Epson SpectroProofer, EFI has automated the complete creation process
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Simply chose the workflow requiring optimization and go to lunch
Actual Example of Color Accuracy Using 3CC Technology
Label Automatically Created and Printed by EFI
Automatic Workflow Color Optimization - 3CC Files
Epson Proofing Edition Series