Re: Photopolymer Plate Options

[SusanV <susanvoss3@gmail.com>]

Chris,

Thanks so much for noticing that section in Dan Weldon's book and
bringing it to my attention.  I will be revisiting the book again
today, because I did not remember that!

I add my appreciation to Jon for his time and sharing spirit in
offering all that info on his website.  I have it printed out and
bound in a notebook on my desk!!!

As for driving into town to proof your plates... makes me think we
should figure out a way to soft proof these things.  maybe scanning
them and doing something in photoshop to bring out the tones.

susan

www.dalyvoss.com

On 2/17/07, Christina Z. Anderson <zphoto@montana.net> wrote:
> Mark, and Jon, Keith, Susan, Nancy, etc. etc.!
>
> Second, I went back over my Dan Welden's book, which I love, and he says a
> very interesting point in there which I would love to see if you all, too,
> have found this in practice.  I think this applies to II Test and/or Expose
> the Plate on Jon's website:  (p. 87-88, long) " In general, with the double
> exposure technique the best results are obtained by using equal times for
> both exposures, but you can manipulate the relative times of each exposure
> to influence the final impression.  If you increase the exposure time of the
> screen relative to the positive, say 2 min 15 sec for the screen and
> 1mn15sec for the transparency, lighter tones are strengthened, while some
> darker tones will become darker.  The overall effect is to darken the image
> and is a useful approach for very light transparencies....Yu can also do the
> converse and decrease the time of the screen relative to the positive, say,
> 30 seconds for the screen and 1mn30sec for the transparency. With this type
> of exposure you may gain a better range of midtones, but lose some lighter
> tones.  The overall effect is to lighten an image.  Deep grooves and areas
> of open bite can form, and, by fine tuning the relative times of each
> exposure, you can control the extent of open bite."
>
> Last night I exposed 12 of the same image on a plate at aquatint exposures
> of 1, 2, 3, and 4 minutes and positive exposures on top of 9, 4, and 2
> minutes (curved image).  I will run into town and print today to see how the
> ratio of the two changes the look, but any thoughts on this are appreciated,
> e.g. what percentage do you all find of the whole image do you make the
> aquatint exposure.
>
> If I ever master this, and bromoil, then I will have "arrived". At least
> with gum it is only a wasted piece of paper and no trips to town to use a
> press.
> Chris
>
> ----- Original Message -----
> From: "D. Mark Andrews" <mark@dragonbones.com>
> To: <alt-photo-process-l@usask.ca>
> Sent: Friday, February 16, 2007 9:48 AM
> Subject: RE: Photopolymer Plate Options
>
>
> > Christina,
> >
> > I accidentally deleted you other post, but you can download Jon Lybrook's
> > curve from his site for the KM73 plates:
> > http://www.lytescapes.com/procedures/polymer_photogravure.html
>  > Mark
--
Susan Daly Voss
www.dalyvoss.com