Re: Hope for Epson drivers...
Re: Hope for Epson drivers...
- Subject: Re: Hope for Epson drivers...
- From: Richard Millott <email@hidden>
- Date: Thu, 16 Jan 2003 12:43:17 +1100
At 21:35 15/01/2003 +0100, Ernst wrote:
Dear Ernst,
>
Well it didn't become a rephrasing of the question:
Thanks for coming at this in more detail. It helped me understand more
clearly
some of the misconceptions that surround what a RichGray profile is, but also
in me, because of assumptions that I have about how these profiles are
perceived
in the marketplace.
>
I meant the ink quantities used in the print at the end of the process.
This is determined, as always, by the ink quantities set up at the time the
original (lets call it the source profile) is built.
At this point, I have to impress upon you that RichGray profiles are in fact
colour profiles. (either RGB or CMYK) If you look at the 3D gamut of these
profiles in ColorThink or iccToolBox Pro, the gamut is the ful gamut of the
original (source) profile.
>
The
>
7500 with its Archival pigment inkset has a bad reputation on metamerism.
RichGray profiles will not solve metameric issues but WILL eliminate any
crossover curves that usually exist in full colour gamut inksets.
>
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).
Not sure I want to comment on nut sizes. :-)
But I have no reason to dispute your observations.
>
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.
I will send you(of list), two profiles, an original and its Gray version.
Please note that both profiles have the same sized gamuts because they are
built from the same spectral data, but one will print colour and the other
will print as shades of gray.
>
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.
Maybe or maybe not. All that was important to him was overcoming the
crossover
curve issues he was experiencing with his 7500. I think he was and still is
very happy with the results he is getting from his 7500 but overcoming his
frustration was the main gain.
>
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 is a software solution, like building a good profile is, that solves a
frustrating world wide problem, fast and efficiently, irrespective of the
colourspace or inkset.
>
It will be nice for a small gamut inkset that doesn't
>
have metamerism and has a longer tonal scale.
Like I mentioned, it will not solve metamerism unless you view the print
under the correct lightsource, but it will completely remove the problem
of crossover curves (in neutral gray ramps) that exist in most full colour
gamut inksets. (but I'm repeating myself.....)
Regards
Richard
---------------------------------------------------------------
Richard Millott & Associates voice: 61 3 9428 1844
Photography & Imaging fax: 61 3 9428 9266
4 Lord Place mobile: 0418 325 565
Richmond 3121 email: email@hidden
Australia web :
http://www.millott.com
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