[Alt-photo] Re: Stochastic screening in Gum
ercdraper at gmail.com
Mon Dec 30 11:01:11 UTC 2013
Can I add my tuppence worth?
I've always added some form of 'noise' to my negatives - I use Photoshop and add it in a variety of ways
An example can be seen on my Etsy shop
With a lot of success - at least I am extremely happy with the results (as are my customers)
I have recently been messing with photogravure - and the same 'dither' does not work nearly as well
I have found a stochastic 'aquatint' screen exposed immediately before a second exposure with the negative works well
Though I don't like the 'industrial' feel I get when I do this with gum. - it looks fake and as if it was a commercially-produced poster
Hope this is of interest,
Working on the go on a smart-phone keyboard
Forgive minor errors, please
> On 9 Dec 2013, at 00:35, Peter Friedrichsen <pfriedrichsen at sympatico.ca> wrote:
> I am intrigued by all the experiments that many here have performed. It seems that attempting to apply a dither to the negative may give mixed results perhaps because of competition with the printers own diffusion algorithms. A laser printer only using its own internal diffusion pattern seems may be the best option but mine laserjet is an amplitude modulated algorithm and I don't like the diagonal pattern.
> I don't think using native inkjet's diffusion pattern on the more advanced printers would cut it because most of these are adding lighter greys for smoother tones. I have concerns that these lighter dots once inverted are not going to harden the gum sufficiently in a top down exposure process as gum printing is.
> My bet would be on using a laser printer having an FM screening pattern as was mentioned, but maximum size is limited in this technology. If I find one to test, Ill pass on the results. The problem is I have about 50 years worth of thinks I would like to try; ain't going to happen!
> Thanks for all of the excellent advice!
> Peter Friedrichsen
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