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  A tone reproduction diagram (a.k.a. Jones diagram) for motion-picture photography. Sensitometry for a camera negative film is shown in the southeast quadrant. Increasing the camera exposure one stop, for example, slides the white, gray, and shadow points 0.3 units to the right. The northwest quadrant shows the sensitometry of the print film. The southwest quadrant shows the negative densities being mapped to exposures onto the print film (e.g., via a printer at the lab). Adjusting the timing lights effectively slides the 45-degree curves left or right. The northeast quadrant shows the overall tone reproduction of the system (i.e., the density on print that results from a given scene exposure).