Re: Yellow pigments and Gum problem(s)

Roman,

this may not that good of a solution, yes you see better your steps on the
"enhanced" scanned version but do you see them on paper. That's the real
thing, increasing contrast digitally is easy but IMHO I would think you'd be
better of keeping the curve untouched and I you even make sure the software
you use doesn't do that for you.

This would be like using a densitometer, using a different light source for
each color, you would get numbers but would they mean?

Yves

----- Original Message -----
From: "roman sokoler" <sokoler@post3.tele.dk>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, November 24, 2005 3:01 AM
Subject: Re: Yellow pigments and Gum problem(s)

> Marek
>
> Thanks for this idea!
>
> Your comment made me do a rescan of the Stouffer and use the
> level-adjustment in Photoshop
> to maximize - and yes!! now I see it the gradations are there - so I think
> you are very right - they are very hard to see.
>
>
> Roman, Denmark
>
>
> .
>
>
> ----- Original Message -----
> From: "Marek Matusz" <marekmatusz@hotmail.com>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Thursday, November 24, 2005 5:10 AM
> Subject: Re: Yellow pigments and Gum problem(s)
>
>
> > Roman,
> > Would it help if you prined your yellow on top of a light blue insted of
> > white. Light yellow over white could be difficult to see the gradations.
> > Marek, Houston
> >
> >
> >>From: Katharine Thayer <kthayer@pacifier.com>
> >>Reply-To: alt-photo-process-l@sask.usask.ca
> >>To: alt-photo-process-l@sask.usask.ca
> >>Subject: Re: Yellow pigments and Gum problem(s)
> >>Date: Wed, 23 Nov 2005 20:02:08 -0800
> >>
> >>
> >>On Nov 23, 2005, at 2:58 PM, roman sokoler wrote:
> >>
> >>>Dear List
> >>>
> >>>I use Yellow (Schmincke PY154) ,
> >>
> >>Hi roman,
> >>Actually this pigment (benzimadazolone H3G, PY154) was also on Juan
> >>Miguel's list of possible yellows from the other day, as Winsor & Newton
> >>"Winsor Yellow" and I forgot to comment on it then. I've never used
this
> >>pigment, but from its description as a "light to very light valued
yellow"
> >>I wonder if it has the tonal depth to print the range of tones that a
> >>darker-valued yellow might (it wouldn't have to be a deep yellow, just a
> >>mid yellow would work fine). But then your statement that it has the
> >>density you desire seems to contradict that idea. If you're saying that
> >>the 7 indistinguishable steps are of sufficient density, then that would
> >>seem to indicate a different problem (overexposure, perhaps?) than if
the
> >>7 indistinguishable steps are very light in value, which would seem to
> >>indicate that the pigment itself is just too light (I'm assuming you've
> >>already ruled out simple things like underexposure and that you're
mixing
> >>the pigment at its maximum strength). This is another case where it
would
> >>be ever so much easier to advise iif one could actually see the thing
> >>rather than trying to guess from a description.
> >>
> >>But this is starting to sound very much like a discussion from last
year.
> >>If you'll look in the archives for June, 2004, and find a thread called
> >>"Gum Tricolor Yellow" you'll find a discussion that started out by
> >>someone asking the very same question, (about a different yellow
pigment,
> >>PY138) The question brought out a lot of good discussion and I think
> >>probably many of the same comments would apply here. So I'd start by
> >>reading that discussion.
> >>
> >>>Phthalo Blue (Sennelier PB15) and Quinacridone Red (Sennelier PR122)
> >>>pigments for tricolor gum printing.
> >>
> >>The only Sennelier paint McEvoy lists under PR 122 is called, according
to
> >>his listing, "quinacridone purple." The color index name for PR 122, in
> >>other words the proper name for the pigment, is Quinacridone Magenta.
I
> >>can't find my Page or Wilcox to check the Sennelier listing, so I guess
> >>I'll just have to be puzzled about this "quinacridone red" designation.
I
> >>personally believe PR 122's reflectance curve, with a significant peak
in
> >>blue, doesn't make it a good magenta for tricolor, but it also depends
> >>no doubt on what the other two colors are, as well as on infinite other
> >>manner of things. Do you find that this pigment works well for you?
> >>
> >>Katharine Thayer
> >>
> >
> >
> >
Received on Thu Nov 24 05:25:46 2005