[Alt-photo] Re: Stochastic screening in Gum

[Edward Draper]

Dear Peter,

I've tried double and single exposure in both

Gum works with the scholastic 'noise' in the negative - so single exposure

But photogravure works best with a separate stochastic exposure - so double exposure

Hope this helps,


Edward



Working on the go on a smart-phone keyboard

Forgive minor errors, please


> On 30 Dec 2013, at 16:30, Peter Friedrichsen <pfriedrichsen at sympatico.ca> wrote:
> 
> Hi Edward,
> 
> If I am reading you correctly, you apply a double exposure in photogravure but not gum? Are you  using any screening with gum? Perhaps you could clarify this for me?
> 
> Regards,
> 
> Peter Friedrichsen
> 
> 
> 
>> On Dec 30, 2013, at 6:01 AM, Edward Draper <ercdraper at gmail.com> wrote:
>> 
>> Dear Peter,
>> 
>> 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)
>> 
>> https://www.etsy.com/listing/92397855/inner-smile-a-collectable-handmade
>> 
>> 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,
>> 
>> 
>> Edward
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 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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