DX number

The DX number is a number which uniquely identifies the type and manufacturer (sensitizer) of a film emulsion. These DX numbers were assigned by the International Imaging Industry Association (I3A), which published and sold a proprietary list of DX numbers for APS and 135 film yearly or as needed. The last edition of the list, entitled DX Codes for 135-Size Film, was published in January 2009.

DX number composition A DX number has two parts separated by a dash: CCC-SS CCC is the "combination code", also known as "DX Number Part 1", which identifies the manufacturer and emulsion type SS is the "specifier number", or "DX Number Part 2", which distinguishes between different varieties within the same family of emulsions For example, Agfa Perutz 3-color ISO 200/24° film is assigned 115-4, while the equivalent Perutz 3-color ISO 100/21° film is assigned 115-3.

DX Part 1 numbers, from the 2008 DX Codes document: + No. Assignee Product(s) 0 colspan=2 1 Agfa-Gevaert Agfapan, Scala 2 Konica Minolta 3 Agfa-Gevaert Agfachrome 4 Eastman Kodak Technical Pan 5 Agfa-Gevaert Agfachrome 6 Eastman Kodak Infrared (HS & Ektachrome) 7 Agfa-Gevaert 8 Fujifilm Superia, Reala 9 Svema DS-100 10 Fujifilm Fujicolor Pro 11 Eastman Kodak Traffic Surveillance 12 Fujifilm Superia 13 Eastman Kodak 14 Eastman Kodak 15 Ferrania + No. Assignee Product(s) 16 Konica Minolta Chrome 17 Agfa-Gevaert Agfacolor 18 Ferrania Scotch Color 19 Eastman Kodak 20 Eastman Kodak Ektachrome 21 colspan=2 (was Tudor) 22 colspan=2 (was Tudor) 23 Eastman Kodak Ektachrome, Elite Chrome 24 Ferrania Imation Chrome 25 Konica Minolta 26 Konica Minolta Centuria 27 colspan=2 28 Konica Minolta VX 29 colspan=2 30 Konica Minolta 31 Agfa-Gevaert Perutz Primera + No. Assignee Product(s) 32 Fujifilm Sensia, Astia, Velvia, Provia 33 Fujifilm (APS) 34 Fujifilm Sensia, Astia, Provia 35 Fujifilm Superia 36 Fujifilm NPH, Super G, Superia, Reala 37 Fujifilm (APS) 38 Fujifilm (APS) 39 Fujifilm Superia 40 Konica Minolta Impresa 41 colspan=2 42 Fujifilm Fujichrome RSP 43 Eastman Kodak MAX / Supra 800 44 Agfa-Gevaert (APS) Agfacolor Futura 45 Agfa-Gevaert (APS) Perutz Primera 46 Agfa-Gevaert Agfacolor, Polaroid Plus 47 Agfa-Gevaert Perutz Primera, Agfacolor + No. Assignee Product(s) 48 Konica Minolta 49 Agfa-Gevaert Agfacolor Optima 50 Konica Minolta Monochrome, Centuria, XG, LV, VX, JX 51 Agfa-Gevaert 52 Eastman Kodak Ektachrome 53 Eastman Kodak Ektachrome 54 colspan=2 55 colspan=2 56 colspan=2 57 colspan=2 58 colspan=2 59 colspan=2 60 China Lucky Film Color Chrome 61 colspan=2 62 colspan=2 63 colspan=2 + No. Assignee Product(s) 64 Eastman Kodak Plus-X, Tri-X 65 colspan=2 (was 3M) 66 Ferrania 67 Eastman Kodak T-MAX 68 Era Photo Era Color 69 colspan=2 70 Eastman Kodak 71 colspan=2 72 Konica Minolta (APS) 73 colspan=2 74 colspan=2 75 colspan=2 76 colspan=2 77 Konica Minolta 78 Eastman Kodak B&W+, Gold, Proimage, Profoto 79 Eastman Kodak BW400CN, Kodacolor, Portra + No. Assignee Product(s) 80 Eastman Kodak 81 Eastman Kodak 82 Eastman Kodak Max, Gold, Ultima 83 Eastman Kodak 84 Eastman Kodak Kodachrome 85 Ferrania Imation Color 86 Ferrania (APS) 87 Ferrania Color FG 88 Shanghai General Shenguang, Shanghai, Seagull, Rainbow 89 colspan=2 90 China Lucky Film B/W SHD 91 Eastman Kodak (APS) 92 Eastman Kodak 93 Eastman Kodak Plus Digital 94 Eastman Kodak (APS) 95 Eastman Kodak Professional, High Definition, Traffic + No. Assignee Product(s) 96 Eastman Kodak MAX, Portra, Gold, Kodacolor 97 Eastman Kodak B&W, Color Negative 98 Xiamen Fuda Pan, GA 99 colspan=2 100 China Lucky Film Color Super 101 colspan=2 102 colspan=2 103 colspan=2 104 colspan=2 105 Ilford Photo 106 Ilford Photo 107 Ilford Photo 108 Ilford Photo Universal, Delta 109 Ilford Photo Pan, Delta, HP5, FP4 110 Ilford Photo XP1, XP2 111 colspan=2 + No. Assignee Product(s) 112 Eastman Kodak Portra 113 Agfa-Gevaert Agfacolor HDC / Vista 114 colspan=2 115 Agfa-Gevaert Perutz SC / Primera 116 Eastman Kodak Kodachrome 117 colspan=2 118 colspan=2 119 colspan=2 (was ORWO) 120 ORWO Media Color CNS 121 ORWO Media Color CNS 122 ORWO Media Color CNN / OCN 123 ORWO Media Orwopan 124 colspan=2 125 colspan=2 126 colspan=2 127 colspan=2

Encoding DX film canister barcode

The DX film canister barcode is printed in human-readable text and also represented as an Interleaved 2 of 5 barcode, located between the electrically read silver and black DX Camera Auto-Sensing Code and the film cartridge exit lip. The size and position conform to the ANSI/NAPM IT1.14:1994 standard. Some film-processing machines optically scan the barcode when the cartridge is inserted for developing.

This film canister barcode is a six-digit number in the format PHHHHE, where: P = proprietary prefix ranging from 0 to 9, assigned by the manufacturer HHHH = hashed DX number E = suffix identifying the number of exposures

For 135 film cartridges the DX number is hashed to produce the four-digit code HHHH. To generate this code, the combination code ( DX Number Part 1) is multiplied by 16 and added to the specifier number (a.k.a. DX Number Part 2). The result is prefixed with zeroes, if necessary, to make four digits. For the Agfa film assigned DX number 115-4 above, the hashed 4-digit code would be 1844:

The DX number can be recovered from the hashed code by dividing by 16, which gives the Part 1 number as the largest whole integer and the Part 2 number as the remainder:

The suffix digit E 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.

DX film edge barcode

Most film produced since 1983 contains barcodes along the bottom edge of the film, recorded in two parallel tracks. The upper track (closer to the sprocket holes) is called the "clock track" and the lower track (along the edge of the film) is called the "data track"; the data track contains the unhashed DX number. However, unlike the film canister DX number bar code, each frame or half-frame's data track code does not provide information about the total number of frames available in the roll.

The data track consists of: A six-bit entry code A seven-bit film product class identification array (DX Number Part 1) One unassigned bit, left blank A four-bit film specifier array (DX Number Part 2) A six-bit frame number One bit to indicate if the position is a "half-frame" A second unassigned bit, left blank A parity bit A four-bit exit code This information identifies manufacturers and chemistry associated with their various film types. If the manufacturer and type of film negative is unknown, the data track can be examined to identify this information. The frame number and half-frame indicator are extensions to the original data track, added by Kodak in 1990.

+Sample data track code Position: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 colspan=6 1 0 1 0 1 0 1 0 0 1 1 1 1 0 1 1 1 1 0 1 0 1 1 1 0 0 1 0 1 0 1 Entry code Film product class(79 in this example) colspan=1 Film specifier(e.g., 15) Frame no.(e.g., 23) Half-frame colspan=1 Parity Exit code

For each of the three encoded numerals, the most significant digit is on the left and the least significant digit is on the right; for example, the film class is a seven-bit number encoded in positions 2 through 8; position 8 is the least significant digit, and position 2 is the most significant digit. In this example, the binary number encoded (1001111) for the film class is equal to 79 (base-10). The parity bit is set or left blank to ensure the total number of "1" bits in positions 1 through 12 plus the parity bit is even. In this example, there are nine "1" bits in positions 1 through 12, so the parity bit is set.

DX number

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