[Alt-photo] Alt-photo-process-list Digest, Vol 176, Issue 7

John Isner john.isner at gmail.com
Mon Oct 9 03:44:33 UTC 2017


I am following the procedure in the book "Easy Digital Negatives" by Peter
Mrhar.  I have already used the procedure successfully to calibrate two
processes and I am working on my third process which is a variation of
cyanotype.

Mrhar's profiling procedure has four steps.  You carry these out before you
start printing actual images: (1) determine the exposure time for "maximum
black" (2) determine the optimal UV blocking color (3) develop a correction
curve (4) develop a curve for soft proofing.  Each step involves making a
print from a negative.  In the case of (1), the negative is just a blank
sheet of transparency film.  In the case of (2), the negative is actually a
positive grid of 256 colors.  In the case of (3) and (4) the negative is a
step wedge printed in color.  Once you start the profiling process, you
can't change anything.  For example, if you determine the exposure time
using transparency film A and later switch to transparency film B, the
exposure time may be too long or too short.  Since I'm doing this to some
extent as an academic / scientific exercise, I decided to do it by the book.

As far as high density ink is concerned, the 256 color step wedge is
printed with high density.  The other negatives are printed using low,
normal, or high density, depending on the process (cyanotype is low, Van
Dyke is high).

On Sun, Oct 8, 2017 at 5:35 AM, Seth Martin via Alt-photo-process-list <
alt-photo-process-list at lists.altphotolist.org> wrote:

> I may have an answer, but first...What process are you using Pictorico
> Ultra Premium for?
>
> Seth Martin
>
> On Sun, Oct 8, 2017 at 8:00 AM, <
> alt-photo-process-list-request at lists.altphotolist.org> wrote:
>
> > Send Alt-photo-process-list mailing list submissions to
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> > Today's Topics:
> >
> >    1. Re:  need an alternative to Pictorico Ultra Premium
> >       (`Richard Knoppow)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sat, 7 Oct 2017 16:09:57 -0700
> > From: `Richard Knoppow <dickburk at ix.netcom.com>
> > To: alt-photo-process-list at lists.altphotolist.org
> > Subject: Re: [Alt-photo] need an alternative to Pictorico Ultra
> >         Premium
> > Message-ID: <8c931141-01cb-b51c-075d-43b2c0bcb717 at ix.netcom.com>
> > Content-Type: text/plain; charset=windows-1252; format=flowed
> >
> >  ?? Your message is on the list so you did the right thing.
> >
> > On 10/7/2017 3:52 PM, John Isner via Alt-photo-process-list wrote:
> > >
> > > I realize I am replying to your personal email address.  How should I
> > reply
> > > in such a way that my reply appears on the listserv?
> > >
> > > Thanks,
> > > John
> > >
> > > FYI I am not the tennis player!
> > >
> > > On Sat, Oct 7, 2017 at 2:38 PM, Keith Schreiber <keith at jkschreiber.com
> >
> > > wrote:
> > >
> >
> > --
> > Richard Knoppow
> > dickburk at ix.netcom.com
> > WB6KBL
> >
> >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
> > _______________________________________________
> > Alt-photo-process-list | altphotolist.org
> >
> >
> > ------------------------------
> >
> > End of Alt-photo-process-list Digest, Vol 176, Issue 7
> > ******************************************************
> >
> _______________________________________________
> Alt-photo-process-list | altphotolist.org
>


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