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Beth with color target - 1972 is an example of something that I did frequently. The grey patch in the middle is a Kodak 18% Grey Card, which has a known reflectance at red, green, and blue wavelengths of visible light. Using a transmission densitometer on the enlarging platform, the color balance of the exposure can be adjusted. The full calibration process involves using a reflection densitometer to verify that the color and density of the print match the values of the original.

Last update: 12-May-96