Re: Yellow pigments and Gum problem(s)

I think I forgot a few words, so I'll try to correct this.

Roman,

this may not be 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 and use a different light source for
each color, you would get numbers allright but what would they mean?

Yves

----- Original Message -----
From: "Yves Gauvreau" <gauvreau-yves@sympatico.ca>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, November 24, 2005 6:27 AM
Subject: 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 06:12:14 2005