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What is background density and why is it important?

April 26, 2017background density

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What is background density and why is it important?

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Background density (Dmax) measures the contrast between the image and the non-image background of the microfilm, and determines the exposure setting to maintain quality control. For more information, see State Archives Technical Publication #9, Producing High Quality Microfilm, pgs. 21 and 24; #11, Introduction to Micrographics, pg. 14; and #77, Managing Imaging and Micrographics Projects.