Hurter and Driffield
Encyclopedia
Ferdinand Hurter
Ferdinand Hurter
Ferdinand Hurter was a Swiss industrial chemist who settled in England. He also carried out research into photography.-Early life:...

(1844–1898) and Vero Charles Driffield
Vero Charles Driffield
Vero Charles Driffield was a chemical engineer who also became involved in photographic research.Driffield was educated at Liverpool Collegiate and Sandbach Grammar School. He also attended a private school in Southport where he came into contact with a Swiss master called Dr Knecht...

(1848–1915) were nineteenth-century photographic scientists who brought quantitative scientific practice to photography
Photography
Photography is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor or chemically by means of a light-sensitive material such as photographic film...

 through the methods of sensitometry
Sensitometry
Sensitometry is the scientific study of light-sensitive materials, especially photographic film. The study has its origins in the work by Ferdinand Hurter and Vero Charles Driffield with early black-and-white emulsions...

 and densitometry
Densitometry
Densitometry is the quantitative measurement of optical density in light-sensitive materials, such as photographic paper or film, due to exposure to light...

.

Among their other innovations was a photographic exposure
Exposure (photography)
In photography, exposure is the total amount of light allowed to fall on the photographic medium during the process of taking a photograph. Exposure is measured in lux seconds, and can be computed from exposure value and scene luminance over a specified area.In photographic jargon, an exposure...

 estimation device known as an actinograph
Actinograph
An actinograph is an instrument for measuring or estimating the amount of light available, in terms of its ability to expose photographic film...

.

See also

  • H&D speed numbers, originally described in 1890, for film speed
    Film speed
    Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system....

    measurements

External links

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