[pure-silver] Re: How do I increase local contrast in my shadows when printing?
- From: Peter Badcock <peter.badcock@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 19 Sep 2005 18:02:19 +1000
OK. So I just did a bit of reading about how contrast is controlled on VC
papers, and it is set by the ratio of blue:green light. Magenta filter is
red+blue (no green). Since the paper is insensitive to red, the blue light
component in magenta is all that is seen by the paper. The only way I could
see that a #47b blue filter would offer any increase in contrast is if it's
ration of blue:green is > than the ratio of blue:green in the magenta
filter. These wratten curves (http://www.geocities.com/thombell/curves.html)
don't give an answer since neither #33 nor #47b show any green component.
I'd rather not buy a blue filter if the effect will be marginal or
un-noticeable. Maybe Ilford's #5 is not the same as wratten#33.
regards
Peter
On 9/19/05, DarkroomMagic <info@xxxxxxxxxxxxxxxx> wrote:
>
> Peter
>
> The blue filter is Wratten #47b. You might have a #25 Red, which is part
> of the tricolor series. The third one is #58 Green. The green filter is the
> softest and the blue filter is the hardest you can get from your paper. They
> are not readily available except for the red filter, but they can be ordered
> from all major filter manufacturers. Mine are from Tiffen.
>
Other related posts:
