[pure-silver] Re: Pre or Post print flash exposure?
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 26 Nov 2005 19:49:16 +0100
Chris
See 'The Theory of the Photographic Process', 3rd edition, page 142-143,
'Pre-Exposure or PostExposure'.
According to tests by Webb and Evans, a High Intensity exposure followed by
a Low Intensity exposure created significantly more density than the other
way around. The difference increases with an increasing low/high density
ratio. However, they note that these effects are most effective in emulsions
exhibiting reciprocity failure.
Nevertheless, I believe their test were done on film and not on paper.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2005-11-26 19:11, "Christopher Woodhouse" <chris.woodhouse@xxxxxxxxxxxx>
wrote:
> I have heard opinions expressed that pre and post flash exposures have
> different effects on a print's appearance, possibly with brief high
> intensity exposures or long low intensity exposures.
>
> Have any of the group seen any references to this or seen differences in
> their own experience?
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