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YELLOW FILTER - The most-popular colored filter used with black and white film. Because a yellow filter absorbs blue (its complementary color), it provides significantly greater contrast between blue and yellow or white subjects. A yellow filter absorbs UV and is useful in reducing haze, particularly in aerial or mountain photography.
YELLOW-GREEN FILTER - Highly-useful for landscapes photographed in black and white, the yellow-green (or yellowish-green, or yellow-greenish) filter only darkens blue skies, whitens clouds, and enhances green foliage.
YELLOW-ORANGE FILTER - This filter has a stronger effect on skies than yellow filters, increasing darkness a great deal. It is also good for reducing blemishes and skin spots.