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(3) An intensity-scale sensitometric exposure is made on each film recorded, whether test or show, to determine processing conditions at time of development.
(4) Step generator densities, particularly those resulting from steps 1, 2 and 10, are read and brought to the attention of the operator at each camera position. If slight adjustments in exposure are indicated the operator makes them just prior to recording time.
(5) A short section of step signal is recorded either at the head or at the tail of each show. An intensity-scale sensitometric exposure is also made.
(6) A characteristic curve is plotted for each show as well as a step density plot resulting from the step generator exposure.
(7) The data thus accumulated are recorded in an operating log maintained at each camera position as well as in our sensitometric file.
The above procedure, described in its necessary detail, may sound laborious and time consuming. Actually the whole process can be accomplished in a few minutes, with spot checks requiring less than 30 sec. Consistency of exposure, over long periods, resulting from this method is ample testimony to its value, and we are convinced that the quality of our product is greatly enhanced by its use.
Discussion
John G. Stott (Du-Art Film Laboratories}: Can you tell us how you take care of the problem of resolution of scanning lines when you do the densitometry of that step-wedge tablet?
Mr. Lovell: When we read the stepwedge with the densitometer? Well, actually we ignore it. We realize that probably there are some strange things going on there, but we haven't tried to analyze what the effects really are. We do get a perfectly satisfactory density reading and while from a theoretical standpoint it may not be what it would be on a normal film, nevertheless it is consistent and it does give us operating data which are very useful.
Mr. Stott: Well, you have to do your densitometry with a visual instrument then, is that correct?
Mr. Lovell: We use the Eastman Capstaff-Purdy Densitometer to make all our readings.
Mr. Stott: You would probably run into some difficulties then if you used the electronic or photocell type of densitometer?
Mr. Lovell: I believe not. We have used a regular ERPI Densitometer with no detrimental effects. We get comparable readings and, of course, they don't read exactly the same, but no two densitometers ever do, I believe, and as long as there is a constant difference between the two, we are happy. I should say that perhaps two ERPI Densitometers do read the same, but not necessarily two different types of densitometers would read the same.
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March 1953 Journal of the SMPTE Vol. 60