Editing DX encoding (section)

{{Short description|Standard marking on film cartridges}}
{{Use dmy dates|date=June 2019|cs1-dates=y}}
[[File:Kodak DX Logo.png|thumb|DX Encoding Logo]]
[[Image:Dx135can.jpg|frame|right|135 Film Cartridge with ''DX barcode'' (top) and ''DX CAS'' code. The CAS code shows this is (top row) ISO 125 film, (bottom row) 24 exposures, +3/−1 f-stop exposure tolerance.  The DX barcode reads 017563, showing [[DX number]] 109-12, 24 exposures.]]
'''DX''' ('''D'''igital inde'''X''') encoding is a standard for marking [[135 film|35&nbsp;mm]] and [[Advanced Photo System|APS]] photographic film and film cartridges, originally introduced by [[Kodak]] in 1983. It includes multiple markings, which are a [[latent image]] [[barcode]] on the bottom edge of the film, below the sprocket holes, a conductive pattern on the cartridge used by automatic cameras, and a barcode on the cartridge read by photo-finishing machines.

The DX encoding system was incorporated into [[American National Standards Institute|ANSI]] PH1.14, which provided standards for 135 film magazines for still picture cameras and was superseded by [[I3A|NAPM]] IT1.14 in 1994; it is now part of [[International Organization for Standardization|ISO]] standard 1007, whose latest revision was issued in 2000.