At 01:13 5/27/02, Winsor Crosby wondered:
I wrote:
In general colored filters are used with B/W to provide tonal separation
between one or more colors. Filter color is selected based on the colors
for which separation is desired. It does require some thinking and some
experience. Using a light yellow and doing portraits of people with
blonde hair can make the hair appear too dark. Using a red and
photographing a red barn can make the blue sky very dark, but the barn
too pale. It takes some experimentation and experience to develop a
skill for visualizing how various B/W filters will affect rendition of
various colors on B/W film.
-- John
John,
Being a novice filter user something you said confused me. I understand
why a red filter transmitting red light would make the barn too light, but
why would a filter that transmits yellow make blonde hair dark especially
when it lightens deciduous foliage which has a strong yellow component in
the green?
--
Winsor Crosby
Long Beach, California
You're right . . . it would further lighten already light blonde hair in a
print. I was thinking about negative density for the yellow from having
experienced it with Tri-X and reversal density with the red having
experienced that with Scala 200X. Whatever color the filter is, it will
make that more dense in the negative and less dense (lighter) in the print
(and the chrome).
I gotta quit writing this stuff late at night. :-)
BTW, a green is sometimes used for foliage separation against other
colors. Also just started using a B+W 470 cyan (cyan = minus red) to
simulate the high blue response of old orthochromatic film. Just ran a
test of this in a friend's studio using some Scala 200X to see what it will
do with skin tones . . . waiting now for the film to come back from the lab
in Florida.
-- John
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