Colored filters are used in Black & White to control contrast within an image. A colored filter will let colors similar to it pass through the filter, creating exposure. The same filter will block colors of the complimentary color, blocking exposure. The net result is lightening of similar colors and darkening of opposite colors.
original color image
desaturated image with no filtration
red filtration
lightens red and similar colors
darkens cyan and other blues and greens
Yellow Filtration
Orange Filtration
Green Filtration
Blue Filtration
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