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

Seth Martin graflex at gmail.com
Mon Oct 9 14:42:35 UTC 2017


John,
Parts of what you've outlined are essentially the same as the method I use
except that I'm not using any color inks. I've tested the color method when
I started making digital negatives and decided to abandon color in favor of
100% Black and 5 shades of diluted black. That said, my interests at least
in the beginning were to make negatives for printing silver gelatin prints.
Recently I've been making negatives for Gum printing using the same black
and gray inks and I'm getting nice results. I haven't been gum printing
that long, but I suspect the no color method will produce what I'm looking
for. I realize the typical method has been centered around determining a
color that blocks the most light, like a reddish green, but this method
didn't produce the smooth gradations I wanted. The limited number of useful
and active ink channels in the color method is why really smooth gradations
are difficult to achieve (maybe just my opinion)
  One of the advantages in not using color (at least with silver gelatin
printing, the new alternative photography) is that you can fine tune
contrast on the final print using a variable contrast filters if needed. If
your negative is already a reddish color the VC paper contrast range is
being effected from the start. My initial tests are to determine Dmax are
made with a "Normal" grade filter in the mix. As it is I rarely have cause
to alter my filtration by much if any.
   Like most of you, I'm using QuadtoneRIP to control ink flow and to print
my negatives with no curves applied in Photoshop. There is no reason that
you couldn't make QTR curves that would make use a standard color ink set
where all the channels were in play, but it's much easier to buy empty
carts and mix my own shades of gray. Has anyone else experimented with
mixing their own inks for black only printing....I'd be interested in
hearing what your experiences have been.

Sorry for the extra long post,
 Seth

On Sun, Oct 8, 2017 at 11:44 PM, John Isner <john.isner at gmail.com> wrote:

> 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:
>>
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>> > than "Re: Contents of Alt-photo-process-list digest..."
>> >
>> >
>> > 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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>
>


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