Re: Controlling 6 or 7 inks
Re: Controlling 6 or 7 inks
- Subject: Re: Controlling 6 or 7 inks
- From: bruce fraser <email@hidden>
- Date: Thu, 24 Oct 2002 13:12:27 -0700
At 3:33 PM -0400 10/24/02, Joshua Lubbers wrote:
I'm not really sure what your asking but I'll take a stab
Yes the Epson 7600 is 7 inks and the Hp 5000 is 6 inks but both inksets are
CMYK inksets. Light Cyan, Light Magenta, and Light black, even though they
are a seperate ink channels, are still taken into consideration when builing
an ICC profile since they are variations of CMYK. The profile takes into
consideration all 7 inks during profile creation so all inks are being taken
advantage of even though the profile is a CMYK profile.
It is possible to make a 6 or 7 color profile but it is only done when using
additional inks that are not a variation of CMYK (Orange and Green for
example)
A bigger issue may be what program is being use to print. Not many RIP's or
Print drivers can truly print and control 6 or 7 different ink channels.
I don't know photoprint but I would bet anything that it only handles RGB
profiles. It is certainly possible to make an RGB profile for either the
Epson or the HP with any of the profiling packages available but you would
lose control of the black channel, which is unacceptable to color critical
users.
Unless you're printing through one of a handful of RIPs that bypass
the printers' native screening and control the printhead directly,
any control over black generation is illusory. The stock drivers
deliver RGB input to the black box in the driver that handles both
screening and translation from RGB to CcMmYKk. (This is an OS
limitation that is theoretically removed in OS X, but nobody has made
a stock driver that passes CMYK to the printer without a conversion
to RGB.)
The majority of RIPs handle these printers as RGB devices and feed
that same black box. Any RIP that uses the native screening handles
them as RGB devices, and a fair number that bypass the native
screening still handle them as RGB devices.
So unless you're printing from one of these very few RIPs, you're
better off profiling the printers as RGB, because your data will go
through one fewer conversion.
--
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