[rollei_list] Re: OT: B&W Filters in digital...Pola filters
- From: Eric Goldstein <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 13 Jul 2010 12:46:25 -0400
As we say in the State, now Frank you are dancing...
Eric Goldstein
--
On Tue, Jul 13, 2010 at 11:52 AM, FRANK DERNIE
<frank.dernie@xxxxxxxxxxxxxx> wrote:
> The microphone analogy is extreme and absurd. The differences between film
> and digital are not that big. You still have not said what the difference is.
> Are you stating a fact which you have evidence and experience to support, or
> an opinion?
> I am stating an opinion. It is that the effect, whilst unlikely to be
> identical, would probably be within the tolerance one would get from the
> variability of film from type to type, and tolerance between different
> filters of the same nominal spec.
> That is to say, I would expect one to be able to get the effect one is after
> as accurately as you would on film.
> The effect may not be identical, but neither would it be between 2 rolls of
> film from different batches.
>
> --- On Tue, 13/7/10, Eric Goldstein <egoldste@xxxxxxxxx> wrote:
>
>> From: Eric Goldstein <egoldste@xxxxxxxxx>
>> Subject: [rollei_list] Re: OT: B&W Filters in digital...Pola filters
>> To: rollei_list@xxxxxxxxxxxxx
>> Date: Tuesday, 13 July, 2010, 13:14
>> And again I will reply that there is
>> a difference between filtering
>> light with a green, yellow, orange, etc. before it hits the
>> sensor and
>> applying a photoshop filter in post-processing. The look is
>> different.
>> If you think about how a digital camera works, it would
>> have to be...
>>
>> There are photoshop filters which attempt to mirror the
>> characteristic
>> curves of classic b/w emulsions. They help but again are
>> not the same
>> as shooting the emulsions. This remind me of ProTools
>> plug-ins that
>> supposedly make your 30 dollar boom headset mic sound like
>> a U-87...
>>
>>
>> Eric Goldstein
>>
>> --
>>
>> On Tue, Jul 13, 2010 at 2:52 AM, Frank Dernie
>> <Frank.Dernie@xxxxxxxxxxxxxx>
>> wrote: (snipped)
>>
>> > Do not forget, however, the original question was
>> whether one would need to use green, yellow, orange, etc.
>> filters used in B&W film photography to get their effect
>> in B&W digital photography. Many subsequent responses
>> have drifted away from the original thread (as usual on the
>> internet...)
>> >
>> > In the case under discussion (ie the original query) I
>> am sure that on a non-clipped digital colour file the effect
>> of any filter on the converted-to-black-and-white version
>> can be produced to an acceptable level of consistency (ie at
>> least as good as the effect of the same filter on different
>> B&W films, or at different exposures). It would probably
>> be easy to exactly replicate the effect mathematically as
>> long as the precise filter characteristic is known, though I
>> have no idea whether Photoshop has an easy way to do this.
>> >
>> > Whether one would actually want to do this rather than
>> use a filter is up to the user!
>> >
>> > cheers,
>> > Frank
>> >
>> > On 13 Jul, 2010, at 02:04, CarlosMFreaza wrote:
>> >
>> >> 2010/7/12 Laurence Cuffe <cuffe@xxxxxxx>:
>> >>>
>> >>> What about a Pola-Screen? I can not find a
>> >>> reference to polarization in the IB for my
>> camera.
>> >>>
>> >>> Marc
>> >>>
>> >>> Yes good point. Thats another glaring
>> exception to the notion that it can
>> >>> all be done in Photoshop.
>> >>
>> >> Regarding a polarizing filter for PS and others
>> image edition
>> >> software, it's necessary to distinguish two main
>> practical effects you
>> >> can obtain from a regular true polarizing filter
>> used during the image
>> >> taking. The effect to obtain deeper and darker
>> blues for the sky and
>> >> for the greens, etc. can be obtained using PS or
>> similar software
>> >> judging the image after to take it, you don't need
>> a Pola-Screen for
>> >> this case. It can be done working with the R-G-B
>> channels in PS or it
>> >> can be easily done with simpler tools like the Sky
>> graduated filter
>> >> from Picasa. This is a method for PS:
>> >> http://photoshoptutorials.ws/photoshop-tutorials/photo-effects/polarizing-filter.html
>> >>
>> >> However there is another very useful effect you
>> can obtain from a true
>> >> Pola filter (Rolleipol f.e.) that cannot be
>> obtained from PS and
>> >> similars; this is the effect to eliminate
>> reflections from bright and
>> >> transparent surfaces allowing to capture subjects
>> beyond this surface,
>> >> f.e you wan to capture fishes and stones within
>> clean and transparent
>> >> water but the reflections are avoiding to see
>> them, turning the
>> >> Polafilter you'll find a point where the light is
>> polarized and the
>> >> reflections are eliminated allowing to capture
>> fishes and stones. If
>> >> you want to capture the _real_ image for this and
>> similar cases, you
>> >> need to use the filter during the image taking, PS
>> cannot invent the
>> >> real subject.
>> >>
>> >> Carlos
>> >> ---
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