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Variations in processor conditions are monitored
on this step.
• Contrast Index: An indicator of the slope of the
straight-line portion of the D-Log E Curve is
called Contrast Index. Select the step closest to
but not larger than 2.20D. Subtract from this step
the step closest to but not lower then 0.45D.
Contrast Index is used to monitor processor
variations in conjunction with the Speed Index.
FIGURE 1. D-Log E Curve
Optical density versus relative log exposure for typical
radiographic film.
Selection and Use of Film
CONTRAST INDEX
SPEED INDEX
BASE+FOG