Laboratory Tools and Techniques
For many years the technical community of the motion picture industry has been searching for and evaluating methods of implementing "dye-only" analog soundtracks into release prints. The use of "dye-only" analog soundtracks would eliminate the need for soundtrack redevelopment, which is the historical means of reintroducing a variable silver image into analog soundtracks printed on color positive stock. The development and deployment of red L.E.D. (light emitting diode) sound track readers has now made it possible to chart an implementation path which can make this long awaited advancement a reality.
In the Laboratory Aim Density (LAD) printing control method, a standard control patch specifies densities midway between the minimum and maximum of those typically obtained for a normal camera exposure. These specific densities have suggested tolerances for each film type in the duplicating and print system, and are listed in this publication, along with helpful hints for their use and evaluation. All color films in a production, regardless of film type or origin, are timed with respect to the LAD control film. Each frame of LAD control film, having the standard patch, with proven accurate exposures plus other information, is available from Eastman Kodak Company.
The KODAK Digital LAD Test Image is a digital image that can be used as an aid in setting up digital film recorders to produce properly exposed digital negatives and in obtaining pleasing prints from those negatives.
The User's Guide provides instructions for using the test image in day-to-day recording activities as well as general guidelines on calibration of a laser film recorder.
The cross-modulation test serves recording engineers very much as the light meter serves photographers. That is, it helps them determine the proper light exposure to be used when producing a photographic image. The photographer judges the quality of the photograph by viewing it. Similarly, the sound engineer can judge the quality of the sound recording by listening to it.