RE: URL for platinum gum comparison

And it is not just the matter of tonality either. If it were, we can adjust
the tonality/curve either digitally or by positive/negative masking in the
traditional way.

But the fact is that when you do a gum print (at least a traditional gum
print with analog negative), somewhere after the midtone and near the
highlight, you get grainy effect. Depending on the paper and sizing, the
grainy effect might not be too pronounced (so I don't mean very rough,
coarse effect, but the effect can be seen). This is because of the gum layer
is near the top of the tooth (or top of the "punk hair" using the model that
I used before. The tooth or punk hair does not have equal length like a true
nicely trimmed punk hair, but I will get to this later in the summer).

You can see this grainy effect even in a simple print using a step tablet.
When one see that, one can tell already that a single coat gum cannot show
the same look as Platinum because the difference is not only on tonality but
on graininess as well (and I am not saying which one is better because that
depends on the object/purpose of the printing and personal preference. I am
talking talking about the technical side of it).

However, if one understands the concept of duotone and have control of it in
gum process, I believe one can achieve the same tonality and the same (or
perhaps almost the same) smoothness with gum compared with Platinum.

When I setup my printing environment again, I will ask if Pt/Pd printer
might be interested in a test. What I will need is an original negative from
you (one that have full tone but is not so important for you (just in case
there is a loss) and preferably one that you have a duplicate) and a Pt/Pd
print from you. If you are interested, please let me know (either now or
then).

Dave S
 

-----Original Message-----
From: Christina Z. Anderson [mailto:zphoto@montana.net]
Sent: Monday, May 01, 2006 11:05 AM
To: alt-photo-process-l@usask.ca
Subject: Re: URL for platinum gum comparison

Positively--I decided that until I had a carbon print for comparison, I
would choose the process that would make gum look the worst and compare, to
weight the comparison away from gum. The other reason for using pt/pd is
that it gives such an incredibly long tonal scale, especially in the
highlights where it shines and glows with delicacy, it would be a good
indication of long tonal range to compare with a short tonal range process.

I can get with both salt and pt/pd close to 31 steps on a 31 step tablet,
where gum is somewhere between 9 and 12.
chris
----- Original Message -----
From: "Yves Gauvreau" <gauvreau-yves@sympatico.ca>
To: <alt-photo-process-l@usask.ca>
Sent: Monday, May 01, 2006 8:58 AM
Subject: Re: URL for platinum gum comparison

> Christina,
>
> the platinum print doesn't seem to have the same texture (none) as the
> other prints which makes it a bit difficult to compare don't you
> think?
>
> Regards
> Yves
>
>
> ----- Original Message -----
> From: "Christina Z. Anderson" <zphoto@montana.net>
> To: "Alt, List" <alt-photo-process-L@usask.ca>
> Sent: Monday, May 01, 2006 8:45 AM
> Subject: URL for platinum gum comparison
>
>
>> http://www.loris.medici.name/Christina_Anderson/Gum_Platinum_Compare.
>> jpg
>>
>> Here 'tis.
>> Chris
>
>
Received on 05/01/06-09:22:01 AM Z