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DX encoding
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===DX cartridge barcode=== [[File:Agfaphoto APX 400 (new emulsion) 135 film cartridge 04.jpg|thumb|right|upright|Agfa APX 400, cartridge number 017712]] Next to the film exit lip is an [[Interleaved 2 of 5]] [[barcode]] and a printed number. The six digits represent the I3A assigned [[DX number]] (middle four digits), the number of exposures (last digit) and a proprietary manufacturer's code (first digit). The DX number identifies the manufacturer, film type, and by inference, the necessary developing process type. This is used by automatic photo-finishing machines to correctly process the exposed film.<ref name=":0" />
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