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Photographic film is a sheet of plastic (polyester, celluloid (nitrocellulose) or cellulose acetate) coated with an emulsion containing light-sensitive silver halide salts (bonded by gelatin) with variable crystal sizes that determine the sensitivity and resolution of the film. When the emulsion is subjected to sufficient exposure to light (or other forms of electromagnetic radiation such as X-rays), it forms a latent (invisible) image. Chemical processes can then be applied to the film to create a visible image, in a process called film developing.
In black-and-white photographic film there is usually one layer of silver salts. When the exposed grains are developed, the silver salts are converted to metallic silver, which block light and appear as the black part of the film negative.
Color film uses at least three layers. Dyes added to the silver salts make the crystals sensitive to different colors. Typically the blue-sensitive layer is on top, followed by the green and red layers. During development, the silver salts are converted to metallic silver, as with black and white film. The by-products of this reaction form colored dyes. The silver is converted back to silver salts in the bleach step of development. It is removed from the film in the fix step. Some films, like Kodacolor II, have as many as 12 emulsion layers, with upwards of 20 different chemicals in each layer.
More on [ Photographic film ]
Super excited for her groups innovation film tomorrow :)
thespenakanakos (Thespena Kanakos) Wed, 04 Nov 2009 01:39:26 -0000
Super excited for her groups innovation film tomorrow :)
@DrewDaywalt i.e. night film/Oldboy-Fight Club/ thinking about tech merits/cinematography/beauty made me want to watch again-so thx!
mthing (mthing) Wed, 04 Nov 2009 01:39:14 -0000
@DrewDaywalt i.e. night film/Oldboy-Fight Club/ thinking about tech merits/cinematography/beauty made me want to watch again-so thx!
@oneSHOTmike i love those gummi bears too! so when are u gonna film me??haha
thisgirlisfire (Talita) Wed, 04 Nov 2009 01:39:12 -0000
@oneSHOTmike i love those gummi bears too! so when are u gonna film me??haha
RT @ExtremPaul: Running 3200 miles barefoot for charity. This guy is crazy #film http://bit.ly/1Eznee
SupSappel (SupSappel) Wed, 04 Nov 2009 01:39:01 -0000
RT @ExtremPaul: Running 3200 miles barefoot for charity. This guy is crazy #film http://bit.ly/1Eznee
About to watch ONCE on DVD. I adore this film sooo much
TheRawBee (Robbie C) Wed, 04 Nov 2009 01:38:55 -0000
About to watch ONCE on DVD. I adore this film sooo much
RT @SupSappel: Who ya gonna call? The Ghostbuster's hotel in Los Angeles: http://bit.ly/YgGM4 #hotels #film (@janelasky)
tjajpjtravel (Tyler Jackson) Wed, 04 Nov 2009 01:38:49 -0000
RT @SupSappel: Who ya gonna call? The Ghostbuster's hotel in Los Angeles: http://bit.ly/YgGM4 #hotels #film (@janelasky)
Diamond Camera - Sells all types of film including Polaroid and photo storage products.
Meta Description: [ Diamond Camera carries photography supplies including 35mm print and slide film in black & white and color from Fuji, Kodak, Polaroid, and 3M at discount prices. ]
Fastcam - One touch cameras custom designed and binoculars.
Mailshots - Suppliers of photographic films, batteries and digital accessories for the professional and amateur photographer.
Meta Description: [ Camera film, Batteries, Ink Cartridges, Paper, Smart Media and Compact Flash Cards, Xd picture cards,Secure Ordering ]
Profilm - Black and white, color and 35mm print film.
Universal Film Distributors - Offers photographic film including Kodak, Fuji, Polaroid, Ilford, Konica, and Agfa, as well as camera equipment and batteries.
Meta Description: [ UNIVERSAL FILM DISTRIBUTORS- supplier of Kodak, Fuji, Agfa, Konica and Polaroid discounted photographical print & slide films. ]
ZReiss - Offering Kodak, Fuji, Agfa, and Polaroid film plus camcorder batteries, video tapes and photography accessories.
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