DX number: Difference between revisions
→DX Film Canister Barcode: add photo |
mNo edit summary |
||
| Line 5: | Line 5: | ||
The '''DX number''' was assigned by the [[International Imaging Industry Association]] (I3A). It uniquely identifies the type and manufacturer (sensitizer) of a film emulsion. A proprietary list of DX numbers for [[Advanced Photo System|APS]] and [[135 film]] was prepared yearly or as needed. (''DX Codes for 135-Size Film'', 2004, I3A; last edition was from January 2009). The list was available for sale from the I3A. |
The '''DX number''' was assigned by the [[International Imaging Industry Association]] (I3A). It uniquely identifies the type and manufacturer (sensitizer) of a film emulsion. A proprietary list of DX numbers for [[Advanced Photo System|APS]] and [[135 film]] was prepared yearly or as needed. (''DX Codes for 135-Size Film'', 2004, I3A; last edition was from January 2009). The list was available for sale from the I3A. |
||
==DX |
==DX number composition== |
||
A DX number has two parts separated by a dash: the "combination code" also known as "DX Number Part 1" followed by a "specifier number", or "DX Number Part 2". For example, [[Agfa Perutz]] 3-color [[ISO 200/24°]] film is assigned 115-4 (I3A). |
A DX number has two parts separated by a dash: the "combination code" also known as "DX Number Part 1" followed by a "specifier number", or "DX Number Part 2". For example, [[Agfa Perutz]] 3-color [[ISO 200/24°]] film is assigned 115-4 (I3A). |
||
==DX |
==DX film canister barcode== |
||
[[File:Kodak 400 color film DX code.jpg|right|thumb|Codes on Kodak ISO 400 color negative film]] |
[[File:Kodak 400 color film DX code.jpg|right|thumb|Codes on Kodak ISO 400 color negative film]] |
||
For 135-film cartridges the DX number is [[hash function|hashed]] to produce a four digit code. A suffix digit for the number of exposures and a manufacturer's proprietary prefix digit are concatenated to form a 6-digit decimal code. The code is printed in [[human-readable]] text and also represented as an [[Interleaved 2 of 5]] [[barcode]]. Size and position conform to the [[American National Standards Institute|ANSI]]/[[National Association of Photographic Manufacturers|NAPM]] IT1.14:1994 standard. |
For 135-film cartridges the DX number is [[hash function|hashed]] to produce a four digit code. A suffix digit for the number of exposures and a manufacturer's proprietary prefix digit are concatenated to form a 6-digit decimal code. The code is printed in [[human-readable]] text and also represented as an [[Interleaved 2 of 5]] [[barcode]]. Size and position conform to the [[American National Standards Institute|ANSI]]/[[National Association of Photographic Manufacturers|NAPM]] IT1.14:1994 standard. |
||
| Line 22: | Line 22: | ||
The barcode is optically scanned by many film-processing machines when the cartridge is inserted for developing (Kodak patent ''5761558''). |
The barcode is optically scanned by many film-processing machines when the cartridge is inserted for developing (Kodak patent ''5761558''). |
||
==DX |
==DX film edge barcode== |
||
Most film produced since 1983 contains a bar code at the bottom edge, which contains both the above "DX Number Part 1" and "DX Number Part 2".<ref>{{Cite book|last=|first=|title=DX CODES FOR 135-SIZE FILM|publisher=International Imaging Industry Association, Inc. (I3A)|year=2008|isbn=|location=White Plains, NY|pages=}}</ref> This information identifies manufacturers and chemistry associated with their various film types. These codes are printed on the "data track" below another bar code called a "clock track". The data track also includes a start entry pattern, frame number information, including indicating if a position is a "half-frame", a parity bit, and an exit pattern. If the manufacturer and type of film negative is unknown, a negatives' edge bar code can be examined to identify this information. |
Most film produced since 1983 contains a bar code at the bottom edge, which contains both the above "DX Number Part 1" and "DX Number Part 2".<ref>{{Cite book|last=|first=|title=DX CODES FOR 135-SIZE FILM|publisher=International Imaging Industry Association, Inc. (I3A)|year=2008|isbn=|location=White Plains, NY|pages=}}</ref> This information identifies manufacturers and chemistry associated with their various film types. These codes are printed on the "data track" below another bar code called a "clock track". The data track also includes a start entry pattern, frame number information, including indicating if a position is a "half-frame", a parity bit, and an exit pattern. If the manufacturer and type of film negative is unknown, a negatives' edge bar code can be examined to identify this information. |
||
| Line 32: | Line 32: | ||
==References== |
==References== |
||
<references/> |
<references/> |
||
== Further reading == |
== Further reading == |
||
Revision as of 02:59, 3 December 2021
 |
The DX number was assigned by the International Imaging Industry Association (I3A). It uniquely identifies the type and manufacturer (sensitizer) of a film emulsion. A proprietary list of DX numbers for APS and 135 film was prepared yearly or as needed. (DX Codes for 135-Size Film, 2004, I3A; last edition was from January 2009). The list was available for sale from the I3A.
DX number composition
A DX number has two parts separated by a dash: the "combination code" also known as "DX Number Part 1" followed by a "specifier number", or "DX Number Part 2". For example, Agfa Perutz 3-color ISO 200/24° film is assigned 115-4 (I3A).
DX film canister barcode
For 135-film cartridges the DX number is hashed to produce a four digit code. A suffix digit for the number of exposures and a manufacturer's proprietary prefix digit are concatenated to form a 6-digit decimal code. The code is printed in human-readable text and also represented as an Interleaved 2 of 5 barcode. Size and position conform to the ANSI/NAPM IT1.14:1994 standard.
To generate digits 2 through 5, the combination code is multiplied by 16 and added to the specifier number. The result is prefixed with zeroes to make 4 digits. For the Agfa film 115-4 above, the digits would be 1844 (16 × 115 + 4).
Digit 1 is any digit from 0 to 9 and is assigned by the manufacturer.
Digit 6 is a code digit for the number of full-frame exposures: 1 is for 12 exposures, 2 for 20 exposures, 3 for 24, 4 for 36, 5 for 48, 6 for 60, 0 for 72 and 7 for non-standard lengths such as 24 + 3.
The barcode is located between the electrically-read silver and black DX Camera Auto-Sensing Code and the film cartridge exit lip.
The barcode is optically scanned by many film-processing machines when the cartridge is inserted for developing (Kodak patent 5761558).
DX film edge barcode
Most film produced since 1983 contains a bar code at the bottom edge, which contains both the above "DX Number Part 1" and "DX Number Part 2".[1] This information identifies manufacturers and chemistry associated with their various film types. These codes are printed on the "data track" below another bar code called a "clock track". The data track also includes a start entry pattern, frame number information, including indicating if a position is a "half-frame", a parity bit, and an exit pattern. If the manufacturer and type of film negative is unknown, a negatives' edge bar code can be examined to identify this information.
Unlike the film canister DX number bar code, each frame or half-frame's data track code doesn't provide information about the total number of frames available in the roll.
See also
References
- ^ DX CODES FOR 135-SIZE FILM. White Plains, NY: International Imaging Industry Association, Inc. (I3A). 2008.
Further reading
- "Film Emulsion Codes" (PDF). 1.14. evertz. 2012-05-01. Archived (PDF) from the original on 2017-06-09. Retrieved 2019-06-09.