Jason,
Joost seems similarly confused on one point as I do.
Backtracking to William Willis' (1841�1923) original platinum process,
this produces images which are neutral black with a bias toward a deep
blue black, that is, in its basic form. Later modifications to his
process included, first of all, palladium (the chloride) which extends
the tonal range and increases the warmth of the end result - shifting
the colour to a deep purple-brown-black in the shadow areas. If in
addition, two or three drops of gold chloride (gold 3) are added to
the sensitiser this imparts a subtle rose tint to the highlight areas.
Most platinum printers and photographers that I know in the UK tend to
reject any modifications that might possibly bias their prints towards
green!
Back to digital simulation.
ImagePrint possess a subtle and extensive range of controls for this
form of manipulation and which is about on a par with that of
QuadtoneRIP ( which I use). The basic split tone controls can be quite
simply configured to give results that are almost impossible to
distinguish from a platinum-paladium print.
I would recommend the use of William Turner - Heavy Weight 310gsm
available from Fotospeed or one of their US agents; checkout their
website for info on:
Hahnem�hle German Etching, 310 gsm
and William-Turner-310gsm.
Michael
On 6 Oct 2008, at 15:01, Joost Horsten wrote:
> Hi Jason,
>
> As I was a bit intrigued your post I checked out the link the Ken
> provided and I played a bit with the hue/saturation curves he
> suggested. It turns out that the platinum and platinum curves do not
> seem to provide any greenish tones at all.... They are more in the
> warm-
> brownish area. Isn't that what you're seeking for?
>
> I checked a bit the Lab a and Lab b values one gets with these
> hue/saturation curves, but most of them are around Lab b ~ 5-7 (so
> towards the yellow, but desaturated enough to use carbon only and not
> needing yellow) and Lab a ~ 2 (so just a bit towards the red). Such
> tone should be very easy to achieve by mixing a warm QTR curve and a
> selenium QTR curve. As a matter of fact, this turns out to be one of
> my
> favorite settings of my 2100 + UT3D inks (an inkset that includes a
> specific selenium toner). (Unfortunately, my 2100 passed away this
> summer and I am now getting up to speed on my new 3800 + UC inks.)
>
> However, I checked the provided QTR curves and there do not seem to be
> any selenium curves for the 2400. So, you're still on your own to
> create that. As said in my earlier post, I'm currently working on a
> selenium curve for the 3800. I'm happy to share it, but it will only
> work for you as source of inspiration.
>
> I'm not sure how serious you are in this, but if toned B&W printing is
> really your thing, I would seriously consider to set up a dedicated
> printer with UT3D inks.
>
> Joost
>
>
>
>
>
Michael Gray
exxmwg@...
http://www.michael-gray.org
Director and Partner: Image Research Associates
Curator: National Trust Fox Talbot Museum 1989-2004
External Adviser: British Library: Department of Manuscripts
Jerwood Project Board 2001-2006
Consultant: Arquivo Nacional de Fotografia, Museus Portugu�s,
Lisbon 1992-
Scientific Director: University of Pordenone and Udine Consortium,
Ikonscentre Project Pordenone 1994-2002
Monmouth House | 4 Bath Road | Beckington | Frome | BA11 6SW | United
Kingdom
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