Xerox 4.2 - Manual (Page 23)

RGB Workflow
RGB Relative Colorimetric Intent
RGB rendition for color v3.5 includes a substantial
change in the overall tone reproduction. RGB input will
have an accurate mapping of tone reproduction down
to the minimum printer L*. The visual appearance of all
color RGB files features more color saturation and
higher contrast.
GCR Strategy
A new Gray Component Removal (GCR) strategy
enables higher chroma in darker colors. Darker,
chromatic colors appear with a lower L* and a higher
chroma. A new gamut mapping strategy enables very
high chroma calls to intersect very high chroma on the
iGen3 gamut boundary. This strategy offers enhanced
printing to wide gamut RGB source profiles.
DocuSP 3.8 and 4.0 to 4.1 Differences Document 19