Ink emulation mode, 5000ps only, Cmyk ink emulation – HP DesignJet 500 User Manual
Page 217: Rgb ink emulation, Ink emulation, Emulation mode

Ink Emulation Mode
In your driver which was supplied with your printer,
there are settings which you can use to emulate the
color behavior of offset printing presses as well as the
usual RGB monitors. To get accurate color for your
proof, select the CMYK color emulation mode which
matches your offset printing standards. The selections
are:
NOTE: These settings have no effect if the application
is defining its own CMYK space, known as
calibrated CMYK or CIEBasedDEFG in
PostScript terminology.
RGB Ink Emulation
Native - RGB ink emulation
sRGB
Apple RGB
Adobe RGB
Colormatch RGB
NOTE: These settings have no effect if the application
is defining its own RGB space, known as calibrated
RGB or CIEBasedABC in PostScript terminology.
5000PS only
CMYK Ink Emulation
Native - No CNYK emulation
SWOP - U.S. Specification for Web Offset Printing
TOYO - Japanese standard for offset press
EuroScale - European standard for offset press.
DIC - DAINIPPON Ink Company