The plot of film density versus exposure time is called a H & D curve.

Name: The plot of film density versus exposure time is called a H & D curve.
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This is correct. The H & D curve is named after the inventors of the film densitometer, Hurter and Driffield, and shows the relationship between the density of the developed film and the amount of exposure it received during the shooting process.

The Plot of Film Density Versus Exposure Time Is Called