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3-8
Splitting Steps
A densitometer can be used to assist in determining a fractional difference
in step scales. When measuring density, make several measurements to
avoid being influenced by pinholes.
Example
•
Pick a step from the reference with a density greater than .15 and less
than 2.0.
•
Find the steps on the second scale that straddle the first. In the example
the reference is .30, step "A" is .24 and step "B" is .40. (Ref. - A) / (B -
A) = .06 / .16 = .375. The example step is .375 steps under the reference.
Matching with a meter
If an integrating meter is available that has a photocell that matches the
film, it can be used to match the surfaces. We recommend that the results
be verified on film.
•
Make a reading on the reference surface and then the surface to be
adjusted.
•
Divide the reading on the surface to be adjusted by the reading from the
reference surface.
•
Multiply the current calibration number by the result above.
Original
Reference
Second Scale
94MS41 Rev. C1 S/W Ver. 2.06
A
B
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