Re: Update on HP 10/20PS printers
Re: Update on HP 10/20PS printers
- Subject: Re: Update on HP 10/20PS printers
- From: email@hidden
- Date: Tue, 4 Dec 2001 10:52:15 EST
In a message dated 12/4/01 10:19:03 AM, email@hidden writes:
>
> Its the simulation proof at fault... an inkjet with a good RGB profile
>
and
>
> one with a good CMYK profile (not used for simulation) offer nearly
identical
>
> gamuts for bright colors... the enlarged CMYK profile gamut is mostly
>
> theoretical, from the added dark tones that the black generation adds.
>
>
agreed.
>
>
> The
>
> HPs are expecting the file to be in final device space, with is rather
>
> inconvenient for files that may go to multiple output devices, especially
>
if
>
> any of them are RGB. A color server may be the practical answer, but
>
adds to
>
> the cost.
>
>
not quite; the 10/20ps are expecting *proofing* files to be in final device
>
space (like SWOP CMYK), but you can perfectly well send RGB data to the
>
rip and
>
use it to generate "presentation prints"; i.e. no simulation involved,
>
"as good
>
as it gets" printing (using P intent). If the PS file sent to the rip
contains
>
an embedded RGB profile (PS CSA) that will be used as input profile,
otherwise
>
the default RGB profile selected in the rip/driver UI will be used.
Fair enough, a simple single intent RGB backdoor is useful... rather than
having to convert all the images and color definitions to the inkjet profile.
>
>
The 50ps additionally offers the option to send RGB data (with embedded
>
or
>
default profile) to the rip, have it separated to press CMYK (SWOP etc)
>
internally, and then converted back into its native device color space
>
with
>
colorimetric intent, i.e. for proofing. This is equivalent to separating
>
to
>
press CMYK externally, then sending press CMYK to the rip with the
appropriate
>
CMYK input (simulation) profile selected (and the output profile
corresponding
>
to the media and printmode used).
This approaches full flexibility (though this is the expensive model, a
comparison to a cheaper RIP and a color server is still in order) but I would
need to see it work with, say, a six channel press profile before I got too
excited... if that is possible you have my undivided attention! Can that
"press CMYK" be "press CMYKOG" if the profile is available?
C. David Tobie
Design Cooperative
email@hidden