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.
addition to these tests, the film is again measured for thickness of base and emulsion, tested for resistance to processing troubles, and examined for clearness following processing under practical conditions.
Resistance to static, which might be encountered under certain laboratory conditions in high speed printing and developing, is tested by a special machine, while gray base negative materials are further checked to assure density and color of the gray base. Specimen film strips from these tests are filed for future use.
At regular intervals, cans of film are picked at random from finished production, opened in daylight, and inspected for packing and for any possible film defects which are visible. Other rolls of finished film are held in stock to be used for reference purposes after the remainder of the production has left the factory. These are subjected to periodic tests, not only throughout the reasonable life of the film, but for an additional period as well, in order to study any changes which may take place in the film with age.
As a final and concluding test at the time of production, samples of negative materials are regularly exposed in a professional motion picture camera under conditions of practical use, and are then processed according to approved film laboratory practice. Prints are made on samples of positive material and these prints are machine developed according to normal laboratory procedure. Finished prints are carefully examined by projection and by slow and painstaking hand rewinding.
As the reader may have guessed by now, the most minute details in the manufacture and testing of photographic film are carefully recorded for future reference, and though unknown to the public, one may say that the private life of a roll of film has been as thoroughly chronicled as that of the famous Dionne quintuplets. For this reason users of photographic materials should always refer to film by the emulsion number whenever it is necessary to discuss technical matters with the manufacturer.
Much effort and research is being directed toward improving both the methods of production and the methods of testing film, in order that the cinematographer may have the best possible materials at his command. To meet problems created by the many new types of film which were unknown a few years ago, modification of the testing procedure has often been necessary, and the newer ultra sensitive panchromatic films are examples of material requiring additional routine tests which were previously unnecessary.
Although the high degree of perfection and uniformity found in modern positive and negative materials is regarded as commonplace by the motion picture industry, a moment's consideration of the unparalleled and elaborate precautions which enter into the routine production of photographic film, should enable one to realize that this perfection is no happy accident, and has only been attained after the most painstaking care in manufacture and the application of every known agency for the elimination of error.
Page Seventeen