>
>Just leave the color filters at home. There's nothing they can do that
>can't be done (and done better) in post processing.
>
>As to using the color filters with a positive color image to produce a
>post-processed B&W, I don't think that's going to work. Remember that
>those red, orange, yellow, green filters are meant to work with negative
>film. They are filtering the complementary colors of the final positive
>image. In this RGB color wheel
><http://en.wikipedia.org/wiki/Complementary_color#mediaviewer/File:RBG_color_wheel.svg>
>
>note that the yellow, orange and red (which you associate with darker
>skies and contrasty clouds on B&W images) are filtering the blue, azure
>and cyan on the opposite sides of the wheel. When working with positive
>RGB images one must filter the positive color as you do when working
>with the software. Imagine what you'd get if you stuck these red,
>yellow and orange filters over a lens shooting an Ektachrome image. Not
>what you'd want although it would work with color negative film which
>you could later convert or print as B&W if desired.
>
Duh! I had completely overlooked that! And I should know better. So,
instead of filtering with the complementary colour as we are used to we now
instead filter with the primary colour.
I came to a conclusion with both the glass and emulated filters yesterday
after hours of experimenting with various methods using the colour star in the
back of "Filter Practice". Just as I had experienced earlier before all this
effort began, the green filter, either glass or emulated, has little if any
effect on the final B&W product, and that can be seen on the histograms.
So, if I want to do detailed B&W photography I'm going to have to stick
with film. Or, learn an entirely different method. Is there perhaps a way of
taking a colour image, producing a negative which can then be filtered,
converted back to a positive image, and then converted to a B&W image?
I do have a Wratten 49 blue filter, so I will go out later today and see
what effect that has.
BTW: I'm told that the best place to buy filters is Copenhägen, as there
is always something Wratten in Denmark.
Chris
When the going gets weird, the weird turn pro
- Hunter S. Thompson
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