[alt-photo] Re: New Platinum Prints

[ender100 at aol.com]

Hi David,


First use a piece of your clear OHP and a Standard Film Step Tablet to get the proper exposure time.
Then Print the 21 step digital step tablet on pictorico using all inks in Adobe 1998 RGB.  
Then make a pt/pd print of it.  
If your Highlights are Blown Out, lower your PT/PD contrast mix.
If your Highlights have too much tone, increase your contrast mix.


Mark




-----Original Message-----
From: David Hatton <davidh6180483 at googlemail.com>
To: The alternative photographic processes mailing list <alt-photo-process-list at lists.altphotolist.org>
Sent: Sat, Apr 10, 2010 5:42 pm
Subject: [alt-photo] Re: New Platinum Prints


Hi Mark,
Are you saying:-
Create a 21 step digital tablet on pictorico (or some other substrate)
Make a print
Compare with stepwedge
increase contrast of emulsion till it looks the same (as the stepwedge)?

I should explain that I am a fully qualified idiot...

Regards
Davidh

On Sat, Apr 10, 2010 at 10: 24 PM, Mark Nelson <ender100 at aol.com> wrote:
> David,
>
> My guess is that you are compensating for the lack of negative density with
> the 1400 inkset by reducing exposure to get good highlight tones thus losing
> DMax. Try using all inks with an RGB black & white negative in Adobe 1998,
> but increase the contrast of the pt/pd mix gradually til it matches the
> density of the negatives. Just print digital 21 step tablets.
>
> The 1400 probably works well with gum because you don't need much density
> for gum.
>
>
>
> Mark Nelson
> www.PrecisionDigitalNegatives.com
> PDNPRint Forum @ Yahoo Groups
> www.MarkINelsonPhoto.com
>
> sent from my iPhonetypeDeviceThingy
>
> On Apr 10, 2010, at 3:42 PM, David Hatton <davidh6180483 at googlemail.com>
> wrote:
>
>> Etienne,
>>
>>
>>> the characteristic lush smoothness one expects from Pt -- I suspect
>>> because
>>> you're using a contrast agent rather than making negatives with the
>>> proper
>>> DR for the process (generally, somewhere between 2.1 and 3.0).
>>>
>> This is something that's been concerning me lately. I've been
>> preparing my negs for palladium digitally using Mike Wares method. The
>> reason for this is that my printer (Epson 1400) won't allow me to use
>> any other method as the inks are not very dense. I manage to get
>> satisfactory gum prints but I'm thinking I could be missing out on
>> something in my palladium experiments. My exposure time using BL tubes
>> is 60 seconds. The prints look ok but nothing special. Could this lack
>> of negative density have something to do with the way they look? If so
>> why?
>> Regards
>> Davidh
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