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Chapter 2 Photographic Quality Assurance
Table  2-1.Examples  of  Some  Common  Logarithms

Photography (Advanced) - Advanced manual for photography and other graphic techniques
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Any  monitoring  system  for  the  photographic process  requires  that  a  reference  or  standard  be established.   By   systematically   comparing   daily production to the reference, you can detect, identify, and correct errors in procedure. Any photographic quality assurance system should be built around the science of sensitometry. In its broadest terms, sensitometry, as applied to the whole photographic   process,   includes   methods   of measurement, process control, and data analysis. It deals with all areas of the photographic process, from exposing film to viewing the final image. SENSITOMETRY In the Photography (Basic), NAVEDTRA 12700, training  manual,  the  quality  of  the  photographic product was judged only from its visual aspects. As a  further  step,  you  should  know  of  other  controlled working   methods   and   techniques   that   ensure photographic   quality.   This   area   of   control,   or sensitometry,   is   one   method   of   using   certain photographic theories to improve photographs while saving time, effort, and materials. With  sensitometry,  variations  from  the  standard and   recommended   corrections   are   expressed   in numbers  and  not  in  terms  of  personal  opinion. Sensitometry  provides  a  permanent  record  of  the process  and  indicates  whether  the  system  was  in control when a given film or paper was processed The accumulated data is helpful for determining the cause  of  poor  quality  and  the  exact  amount  of deviation from the standard. The  first  requirement  in  photographic  quality assurance  is  establishing  a  standard  for  good processing and the range or limit that quality should not exceed. The standard is based on developing the same film or paper that is given a known exposure and   comparing   the   resulting   densities. Black-and-white  processing  is  discussed  first  in  the following paragraphs. Figure  2-1.—A  Photographer’s  Mate  uses  a  densitometer  to  read  a  control  strip. 2-2







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