Color Contrast Filters for
Some of the camera filters are
specifically made for black and white film photography, and it is
usually described by their color. For example, a blue filter would
absorb the green and red color and allow only blue color to go thru,
although most of the filters would not be perfect that they not only
transmit the color of their own but there is also some adjacent color
that would pass thru. A general understanding is the color filters are
used to maintain natural tonal relationships like what we see with
naked eye or to alter the contrast of the image by darkening or
lightening the color tones.
Color contrast filters specifically for
black and white film is usually very strongly colored and thus can
absorb most of the color other than their own. The most common color
contrast filters are the red, blue, green, yellow and orange.
The application of color contrast filters
will take some understanding on the color and also a lot of practical
session. A useful thing to keep in mind is the color triangle rules
whereby the primary colors is the blue, green and red, then there is
the secondary colors or yellow, cyan and magenta besides the primary
colors. Thus in practical, you will see a blue color filter lightening
the blue sky as well as lightening other objects in the image that is
cyan or magenta in color. Contrary, objects that is red, green and
yellow would be darkened.