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Processing  Sensitometric  Strips
Plotting Characteristic Curves

Photography (Advanced) - Advanced manual for photography and other graphic techniques
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Figure  2-2.—Step  tablets. the development processes. It is also called an H and D, D log-H, D log-E, or sensitometric curve. Characteristic curves are plotted on graph paper. The vertical axis represents the amount of density, created by each step of exposure. These logarithmic values are read directly from a densitometer. The density values increase from the bottom to the top of the graph. are uniform. Exposure increases from left to right on the horizontal axis. The  horizontal  axis  of  the  graph  is  used  to indicate log exposure (log H). The horizontal axis represents  the  amount  of  exposure  the  material received.   Exposure   must   be   converted   to   a logarithmic value, so the scale of density and exposure When the sensitometric strip is made with the Eastman Kodak No. 2 Step Wedge (21 step), there is an increase of about 0.15 in density between each step or an increase of 50-percent density. The individual steps should be calibrated by reading the step on a densitometer for the greatest accuracy. The densities of  steps  range  closely  from  0.05  to  3.05,  but  the density of the individual steps may vary slightly. For illustration  purposes,  the  step  tablet  used  in  the following  example  has  exactly  0.15  density  differences between each step. 2-7







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