Re: Epson 5000 - RGB or CMYK
Re: Epson 5000 - RGB or CMYK
- Subject: Re: Epson 5000 - RGB or CMYK
- From: Henrik Holmegaard <email@hidden>
- Date: Sat, 8 Dec 2001 10:06:03 +0100
Abhay Sharma <email@hidden> wrote:
Given the above, what is the best option to use in profiling software - RGB
or CMYK?
It depends on the printing pipeline and not the printer hardware. The
same printer may be fed through one of two pipelines:
QuickDraw only accepts RGB, not Lab and not CMYK. You cannot pass
CMYK drawing commands from an application that supports CMYK to
QuickDraw. This is why say LinoColor 6 has a handy way of making sure
that a color managed scan is not handed off to unknown RGB, but
either to an RGB color space conversion profile, an RGB printer
profile, or to an RGB monitor profile (an ICC type description that
both includes your actual monitor profile and what some call RGB
working spaces).
PostScript / EPS / PDF accepts RGB, Lab, CMYK and custom colors in
any combination in a given file. As your printer actually renders
CMYK and not RGB, you send it a CMYK test chart.
In the graphic arts in general it makes little sense to use the
RGB-only pipeline for which you should choose an RGB test chart in
Eye-One Match or ProfileMaker.
If your printer is fed through the PostScript pipeline, choose a
medium size CMYK test chart. There is no benefit in choosing a test
chart with a huge number of patches. The printer profile is not built
solely off the patches, because profiling applications use an
internal model. Otherwise, we would be measuring enormous quantities
of patches.
/ Henrik