Hurter and Driffield

{{Short description|19th-century photographic scientists}}

Image:H&D curve.png]]

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.

Image:HD Actinograph.jpg.]]

Among their other innovations was a photographic exposure estimation device known as an actinograph.{{cite book | title = The Photographic Researches of Ferdinand Hurter & Vero C. Driffield: Being a Reprint of Their Published Papers, Together With a History of Their Early Work & a Bibliography of Later Work on the Same Subject

| editor = William Bates Ferguson | publisher = London: Royal Photographic Society of Great Britain | year = 1920 | url = https://archive.org/details/memorialvolumeco00hurtiala}}