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0.3 density 100 percent 3.0 LOG EXPOSURE amount of light ANSI ANSl speed areas arithmetic series average gradient base density brightest brightness range camera characteristic curve D(max darkest object decrease density differences density of 0.3 density scale density vs log Development Minutes DUPLICATING or REVERSAL EASTMAN KODAK COMPANY equals exponent exposed and processed exposes the film exposure latitude exposure scale film curves film is called film response curve film speed gross fog KODAK Developer ln the example log E scale log E unit log E value log of 87 logarithmic series negative characteristic normal exposure Optical density paper curves paper grades percent 0.0 percent 12'/2 percent percent 25 percent percent transmittance photographic papers plotted previous number processed film record the scene reduce the transmittance reproduced reversal processing scene photographed series of numbers shoulder shown slope speed point step wedge stops straight straight-line portion