Hurter and Driffield

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File:H&D curve.png
H & D curve used in sensitometry

Ferdinand Hurter (1844–1898) and Vero Charles Driffield (1848–1915) were nineteenth-century photographic scientists who brought quantitative scientific practice to photography through the methods of sensitometry and densitometry.

File:HD Actinograph.jpg
Hurter & Driffield's actinograph.

Among their other innovations was a photographic exposure estimation device known as an actinograph.[1]

See also

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  • H&D speed numbers, originally described in 1890, for film speed measurements

References

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  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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