Dye Coupler

Dye coupler is present in chromogenic film and paper used in photography, primarily color photography. When color developer develops exposed silver-halide crystals, the developing agent molecules become oxidized, and the oxidized developer molecules react with dye coupler molecules to form dye in situ. Silver image is removed by subsequent bleach and fix processes, and the final image will consist of the dye images.

The dye coupler technology has seen considerable advancement since the beginning of modern color photography. In terms of image permanence, major film and paper manufacturers have continually improved the stability of the image dye by improving couplers, particularly since 1980s, so that the archival property of the images are enhanced in modern 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

Technical terms	35 mm equivalent focal length Angle of view Aperture Chromatic aberration Circle of confusion 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	Aerial Architectural Black-and-white Commercial Cloudscape Documentary Erotic Fashion Fine-art Fire Forensic Glamour High speed Landscape Lomography Nature Nude Photojournalism Pornography Portrait Post-mortem Senior Social documentary Sports Still life Stock Street Vernacular Underwater Wedding Wildlife

Techniques	Afocal photography Bokeh Contre-jour Cyanotype Exposing to the right Fill flash Fireworks Harris shutter High speed Holography Infrared Kirlian Kite aerial Long-exposure Macro Mordançage Multiple exposure Night Panning Panoramic Photogram Print toning Redscale Rephotography Rollout Sabatier Effect Stereoscopy Stopping down Sun printing Tilt–shift Time-lapse Ultraviolet Vignetting

Composition	Diagonal Method Framing Geometry and symmetry Headroom Lead room Rule of thirds Simplicity

Equipment	Camera (Pinhole Rangefinder SLR Still TLR Toy View) Darkroom (Enlarger Safelight) Film (Base Format Holder Stock) Filter Flash (Beauty dish Cucoloris Gobo Hot shoe Grid Monolight Snoot Soft box Umbrella Wireless sync) Lens Manufacturers Monopod Movie projector Slide projector Tripod Tripod head Zone plate

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

Digital photography	Digital camera (D-SLR Comparison of D-SLRs Sony SLT MILC Digital camera back) Digiscoping Digital versus film photography Film scanner Image sensor (CMOS APS CCD Three-CCD camera Foveon X3 sensor) Photo sharing Pixel

Color photography	Color Color film (Print Slide) Color management (CMYK color model Color space Primary color RGB color model)

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

List of most expensive photographs List of photographers Outline of photography Photography museums and galleries (category) Portal WikiProject

Famous quotes containing the word dye:

“It will help me nothing
To plead mine innocence, for that dye is on me
Which makes my whit’st part black.”
—William Shakespeare (1564–1616)