A Jones diagram is a type of
Cartesian graph developed by
Loyd A. Jones in the 1940s, where each axis represents a different
variable. In a Jones diagram opposite directions of an axis represent different quantities, unlike in a Cartesian graph where they represent positive or negative
signs of the same quantity. The Jones diagram therefore represents four variables. Each quadrant shares the vertical axis with its horizontal neighbor, and the horizontal axis with the vertical neighbor. For example, the top left quadrant shares its vertical axis with the top right quadrant, and the horizontal axis with the bottom left quadrant. The overall system response is in
quadrant I; the variables that contribute to it are in quadrants II through IV.
Jones diagrams in photography
A common application of Jones diagrams is in
photography
Photography is the visual arts, art, application, and practice of creating images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It is empl ...
, specifically in displaying sensitivity to light with what are also called "
tone reproduction diagrams". These diagrams are used in the design of photographic systems (
film
A film, also known as a movie or motion picture, is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, emotions, or atmosphere through the use of moving images that are generally, sinc ...
,
paper
Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, Textile, rags, poaceae, grasses, Feces#Other uses, herbivore dung, or other vegetable sources in water. Once the water is dra ...
, etc.) to determine the relationship between the light a viewer would see at the time a photo was taken to the light that a viewer would see looking at the finished photograph.
The Jones diagram concept can be used for variables that depend successively on each other. Jones's original diagram used eleven quadrants to show all the elements of his photographic system.
See also
*
Cobweb plot
A cobweb plot, known also as Lémeray Diagram or Verhulst diagram is a visual tool used in dynamical systems, a field of mathematics to investigate the qualitative behaviour of one-dimensional iterated functions, such as the logistic map. The te ...
– similar diagram technique
References
*Walls, H. J. & Attridge, G. G. ''Basic Photo Science.'' London: Focal Press Ltd., 1977.
External links
Example of a motion-picture film Jones diagram* Example of a CRT Jones diagram: .
Science of photography
Diagrams
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