Re: Hope for Epson drivers...
Re: Hope for Epson drivers...
- Subject: Re: Hope for Epson drivers...
- From: "Ernst Dinkla" <email@hidden>
- Date: Wed, 15 Jan 2003 21:35:15 +0100
>
> Then Dan wrote:
>
> >I have prints here from a 7600 that are dead on neutral under *all*
light
>
> >sources made from CMYK ICC profile. I did cheat a bit and created a
"Rich
>
> >Gray" CMYK profile for conversion with IccToolBox. Absolutely no color
>
cross
>
> >overs in my prints and this was printed from a CMYK file. I had friend
>
> >confirm this so I wasn't fooling myself.
>
>
Then Richard wrote:
>
> I don't think that you cheated at all. I think that the RichGray
solution
>
> is so simple and elegant. I have a client who decided against upgrading
>
> his 7500 to the 7600 because he was having so much trouble with
>
neutrality.
>
> He throught that the 7600 would solve the grayscale problems he was
>
having.
>
> The RichGray profile saved him an expensive printer upgrade. As long as
>
you
>
> have a good custom as a starting point, the conversion to absolute
>
neutrality
>
> is easy.
>
> My vested interest with iccToolBox Pro, was as a beta tester.
Then Ernst wrote:
>
What is the result of the "Rich Gray" profile in the print next to its
>
neutrality ?
>
Heavy UCR ?
Then Richard wrote:
>
I don't understand your question. Perhaps you could
re-phrase it.
But I might add that RichGray profiles are still colour
profiles (they always appear within the colour family
from which they originated) but the colour numbers that
constitute the original profile are all changed into
their neutral equivalents <
Well it didn't become a rephrasing of the question:
I meant the ink quantities used in the print at the end of the process. The
7500 with its Archival pigment inkset has a bad reputation on metamerism.
That will not be any better in B&W prints whatever CM system is used with
the exception of a heavy UCR/GCR black generation. Next to that the gamut of
the Archival inkset is of the hazelnut size when compared to the Brazil nut
size of the 7600 Ultrachrome or Epson dye ink gamut. The limited gamut size
of the Archival ink should make it easier to get a neutral grey balance if
it didn't have that metamerism. The hazlenut shape is a quite appropriate
description as the Archival ink also lacks in black density (less on gloss
media). So I can understand that a grey profile shaped like a pillar can
help to make a nice neutral grey print, in this case the pillar is the very
short one of the Archival ink. Heavy GCR can't be used either with the 7500
because the black dot size makes the print very grainy. Epson tried to solve
the 7500 metamerism that way with another driver but that also showed the
black dot size too much. The new drivers for the 5500/10000 worked along the
same line more succesful as the finer droplet sizes made the longer black
less grainy. The best answer is of course the 9600/7600 7 inkset where the
grey allowed a GCR that goes almost from top to bottom + smaller droplet
sizes + another yellow pigment + a sepia black and grey so yellow could be
reduced in the mix. The additional matte black ink then completed the
density problem on matte papers.
You may have saved your client an expensive printer upgrade but he didn't
get the quality of a 7600 B&W or colour print. The RichGray profile is a
software answer that will work well for 6 colour dye ink systems, it is
probably overdone for the 7 colour 7600 system and can't compensate the 7500
physical problems. It will be nice for a small gamut inkset that doesn't
have metamerism and has a longer tonal scale.
It is interesting that the Wasatch SoftRip version 4.5 gives the user now a
choice to use RGB profiles or CMYK profiles. While keeping the linearisation
and inklimit settings for both it adds the black generation and other ink
quantity controls as an extra step in between for the use of RGB profiles.
Rudy Vonk has already written about it. He didn't mention the 3D profile
animation tool also added, a nice tool for the PC user. Both Epson and
ImagePrint have more or less closed "RGB" profile systems, Wasatch SoftRip
4.5 is the open "RGB" profile system with the linearisation etc that users
have asked Epson to deliver. It still is a good CMYK RIP next to that.
Ernst
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