Xerox Enhanced Path - Xerox DocuColor 2045 Color Management Manual

DocuSP color management
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• The incoming job contains embedded profiles that result in
the printer driver creating a Color Space Array (CSA) for the
color data. These PDL instructions are honored by the
system.

Xerox enhanced path

Incoming RGB or CMYK data uses the DocuSP Xerox Enhanced
Path Look Up Table (LUT) or Emulation LUT when performing
the SWOP™ CMYK to DocuSP print engine CMYK
transformation.
Benefits of using this path include:
• Faster RIP time via use of the LUTs as contrasted with the
ICC Path.
• This path preserves the Black (K) channel and Black
darkness.
Look Up Tables provide a quick, effective translation from the
source space to the specific printer's CMYK space. These tables
are faster because the CMYK values are translated directly to
output space, instead of first being translated to device-
independent space and then to the print-engine-specific space.
RGB data is converted using 3 x 4 LUTs.
4 x 4 LUTs provide direct CMYK to CMYK mapping, preserving
black. When pure black is passed through a source profile (ICC
profile path), it is converted to XYZ. Once in XYZ, there is no way
for the color management system to know that the color was
originally pure black. Thus, pure K is converted to a CMYK
combination (Gray Component Removal, or GCR, is involved in
this process). In contrast, the 4 x 4 tables recognize pure K and
output the appropriate K for the source-to-destination mapping.
The following conditions guarantee a job follows the Xerox
enhanced path:
• The incoming job is untagged and using a pre-installed
output profile.
• A Xerox stock is programmed for the job
• A non-Xerox stock that is a member of an unaltered Xerox
color group is programmed for the job
• A Xerox output color profile, included with the system, has
been assigned to the job
Color Management Guide