bw photography and filters (4541.762 computational photography) jehee lee seoul national university
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BW Photography and Filters(4541.762 Computational Photography)
Jehee Lee
Seoul National University
Black-and-While Films
• Most of today’s BW films are panchromatic– Sensitive to blue
Orthochromatic film Infrared film
Panchromatic film
Color Filters
Filters for BW films
• Yellow– Absorbs ultraviolet and blue-violet– Darkens blue sky– Balances panchromatic film to match normal visual
response
• Deep yellow and red– Lightens yellow and red subjects such as flowers– Darkens blue water and sky
• Yellowish green– Outdoor portraits– Balances values in tungsten-lit scenes
Filters Also Used With Color Films
• Skylight or ultraviolet (UV)– Little or no effect with BW film– Protect lens surface from damage
• Neutral density (ND)– Absorbs equal quantities of light from all parts of the
spectrum– Wider aperture or slower shutter speed
• (Circular) Polarizer– Absorbs light waves traveling in certain planes
relative to the filter
Polarizing
Infrared film
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