Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

Feb., 1930] CHARACTERISTICS OF SOUND FILM 193 TABLE V Sensitometric Data for Motion Picture Positive. Developed in D-16 Td 7 Log Ei. 5 Fog R.P. 2.5 1.02 1.18 0.04 74 5.0 1.81 0.40 0.05 73 8.0 2.28 0.07 0.06 71 12.0 2.48 1.93 0.07 71 6.0 2.00 0.22 0.05 72 siderable promise, but further experimental work must be done before definite conclusions as to its utility and practical value can be drawn. As stated previously, the photographic process is concerned with two factors, namely, the rendering of tone and the reproduction of form. The former depends on the sensitometric characteristics of the emulsion, whereas the latter depends primarily on its resolving power and sharpness. This distinction is only partial, however, because those factors obviously affect the tone values; furthermore the properties of an emulsion which determine its sensitometric character TABUS VI Sensitometric Data for an Experimental Emulsion. Developed in D-16 Td 7 Log EJ.& Fog R.P. 2.0 3.6 0.10 0.02 120 4.0 4.0 0.00 0.02 117 6.0 4.7 1.80 0.02 114 8.0 5.7 1.70 0.03 112 12.0 6.0 1.50 0.03 98 4.0 4.0 0.00 0.02 117 istics also determine largely its resolution and sharpness. The nature of the problem should necessarily determine the type of emulsion to be used. Thus in the case of sound recording, where high frequencies consist of photographic images very close together, it is necessary to use an emulsion which has high resolution ; yet it must be sufficiently sensitive to attain the required density with the exposure available. Unfortunately, these two factors bear in general a reciprocal relation. The resolving power of an emulsion is an extremely complex problem depending on a number of variables such as distribution of intensity and contrast in the object, density of the photographic image,