Computer Graphics ( 4190.410 Course Introduction ) Jehee Lee Seoul National University.
BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.
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Transcript of BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.
![Page 1: BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f1e5503460f94c36684/html5/thumbnails/1.jpg)
BW Photography and Filters(4541.762 Computational Photography)
Jehee Lee
Seoul National University
![Page 2: BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f1e5503460f94c36684/html5/thumbnails/2.jpg)
Black-and-While Films
• Most of today’s BW films are panchromatic– Sensitive to blue
Orthochromatic film Infrared film
Panchromatic film
![Page 3: BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f1e5503460f94c36684/html5/thumbnails/3.jpg)
Color Filters
![Page 4: BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f1e5503460f94c36684/html5/thumbnails/4.jpg)
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
![Page 5: BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f1e5503460f94c36684/html5/thumbnails/5.jpg)
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
![Page 6: BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f1e5503460f94c36684/html5/thumbnails/6.jpg)
Polarizing
![Page 7: BW Photography and Filters (4541.762 Computational Photography) Jehee Lee Seoul National University.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f1e5503460f94c36684/html5/thumbnails/7.jpg)
Infrared film