Dye coupler

Dye coupler is present in chromogenic film and paper used in photography, primarily color photography. When color developer reduces ionized (exposed) silver-halide crystals, the developer is oxidized, and the oxidized molecules react with dye coupler molecules to form dye in situ. The silver image is removed by subsequent bleach and fix processes, so the final image will consist of the dye image.

Dye coupler technology has seen considerable advancement since the beginning of modern color photography. Major film and paper manufacturers have continually improved the stability of the image dye by improving couplers, particularly since the 1980s, so that archival properties of images are enhanced in newer color papers and films. Generally speaking, dye couplers for paper use are given more emphasis on the image permanence than those for film use, but some modern films (such as Fujichrome Provia films) use variants of couplers that were originally designed for paper use to further improve the image permanence.

Photography

Outline

Terminology	35 mm equivalent focal length Angle of view Aperture Black and white Chromatic aberration Circle of confusion Color balance Color temperature Depth of field Depth of focus Exposure Exposure compensation Exposure value F-number Film format Film speed Focal length Guide number Hyperfocal distance Metering mode Perspective distortion Photograph Photographic printing Photographic processes Reciprocity Red-eye effect Science of photography Shutter speed Sync Zone System

Genres	Abstract Aerial Architectural Conceptual Conservation Cloudscape Documentary Ethnographic Erotic Fashion Fine-art Fire Forensic Glamour High-speed Landscape Lomography Nature Nude Photojournalism Pornography Portrait Post-mortem Selfie Social documentary Sports Still life Stock Street Vernacular Underwater Wedding Wildlife

Techniques	Afocal Bokeh Brenizer Contre-jour Cyanotype ETTR Fill flash Fireworks Harris shutter HDRI High-speed Holography Infrared Kirlian Kite aerial Long-exposure Macro Mordançage Multiple exposure Night Panning Panoramic Photogram Print toning Redscale Rephotography Rollout Scanography Sabatier effect Stereoscopy Stopping down Strip Slit-scan Sun printing Tilt–shift Miniature faking Time-lapse Ultraviolet Vignetting Xerography

Composition	Diagonal method Framing Headroom Lead room Rule of thirds Simplicity

Equipment	Camera light-field field pinhole press rangefinder SLR still TLR toy view Darkroom enlarger safelight Film base format holder stock Filter Flash beauty dish cucoloris gobo hood hot shoe monolight Reflector snoot Softbox Lens Wide-angle lens Zoom lens Telephoto lens Manufacturers Monopod Movie projector Slide projector Tripod head Zone plate

History	Timeline of photography technology Analog photography Autochrome Lumière Box camera Calotype Camera obscura Daguerreotype Dufaycolor Heliography Painted photography backdrops Photography and the law Glass plate Visual arts

Digital photography	Digital camera D-SLR comparison MILC camera back Digiscoping Digital versus film photography Film scanner Image sensor CMOS APS CCD Three-CCD camera Foveon X3 sensor Image sharing Pixel

Color photography	Color Print film Reversal film Color management color space primary color CMYK color model RGB color model

Photographic processing	Bleach bypass C-41 process Cross processing Developer Digital image processing Dye coupler E-6 process Fixer Gelatin silver process Gum printing K-14 process Print permanence Push processing Stop bath

Lists	Most expensive photographs Photographers Norwegian Polish street women

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This article is issued from Wikipedia - version of the 10/31/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.