From: Tony Conrad (email suppressed)
Date: Tue Jul 14 2009 - 22:06:42 PDT
Notice that what Jeffrey is saying here...
On Tue 07/14/09 4:07 PM , JEFFREY PAULL email suppressed sent:
>... regions of the frame that are barely
> exposed are more influenced by safelight fog than heavily exposed regions.
> If the image will be a negative, the shadow tones with little actual
> exposure light will be strongly influenced by the slight fogging light
> of the unsafe safelight. So, when printed, the shadow tones will be a bit
> lighter than usual, [and] the black parts (the D-max) not so black.
> If the image will be a positive print film, the highlight areas of the
> positive will receive little exposure t[h]rough the highlight parts of the
> NEGATIVE. So the highlight parts become compressed and a bit grey and
> unsparkling. Where either stock [has already received] a lot of exposing
> light in a part of the frame, the slight safelight fog has much less influence.
...is that the added exposure from the safelight affects unexposed areas much more than already exposed areas. That is, the contrast is lowered.
This is the principle involved in "flashing" film stock by evenly exposing the whole roll to a low level of light, in order to decrease the contrast of the image.
Though positive stocks are not multilayer stocks (as negative stocks are), and consequently do not have a great exposure latitude, you may find with careful experiment you can flash positive film stocks
and make them look a little less hi-con than otherwise. Useful, especially if you are shooting the stock as negative.
-----t0ny
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