Re: Photogravure question

Good explanation Jack.
Also, the usage of rosin or asphaltum based aquatints to "screen" the photo
so that it holds ink results in a much more fine and "random" dot.
Basically, it is a better mimic of a continuous tone photo, with less of a
mechanical look then if you were using a screen. The tonal range is among
one of the longest for photomechanical processes. Aquatint also enables you
to go back into the plate after it is etched and proofed for corrections
and/or additions.

----- Original Message -----
From: jack reisland <reislandj001@hawaii.rr.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Sunday, November 02, 2003 2:29 PM
Subject: Re: Photogravure question

>
>
> "Gordon J. Holtslander" wrote:
>
> >
> > Are the resulting prints from photopolymer plates and traditional
> > photogravure sigificantly different?
> >
> > Gord
> >
>
> Yes, indeed they are. Photopolymer etching is a two dimensional process,
where
> the variation in tone is acheived by spacing the ink closer or farther
apart,
> much like an ink jet print. Copper plate photogravure adds a 3rd
dimension, by
> also varying the depth of the cells, or holes etched into the copper
plate, and
> thereby varying the thickness of the ink applied to the paper. This
results in a
> richness and depth in the image, especially in the darker tones, that
cannot be
> matched by photopolymer plates.
>
> J. Reisland
>
Received on Sun Nov 2 13:42:42 2003