TITLE 44: GOVERNMENT CONTRACTS, PROCUREMENT AND PROPERTY MANAGEMENT
SUBTITLE C: GOVERNMENTAL RECORDS
CHAPTER V: LOCAL RECORDS COMMISSION OF COOK COUNTY
PART 4500 LOCAL RECORDS COMMISSION OF COOK COUNTY
SECTION 4500.60 MINIMUM STANDARDS OF QUALITY FOR PERMANENT RECORD PHOTOGRAPHIC MICROCOPYING FILM


 

Section 4500.60 Minimum Standards of Quality for Permanent Record Photographic Microcopying Film

 

a) These standards are concerned with both raw stock for permanent record films and with the processed films ready for storage. They are not restricted to microfilm but apply equally to motion-picture films, roll films, and sheet films. No incorporation by reference in Section 4500.60 includes any later amendments.

 

b) All such film stock shall be of approved permanent type such as meets the minimum specifications of the American National Standards Institute (ANSI) as found in:

 

PH 1.25 1984

 

PH 1.28 1984

 

PH 1.41 1984

 

c) Each frame of microfilm shall be exposed and processed so that every line and character on the document appears on the microfilm with sufficient clarity to permit reproducibility through three successive generations of reproduction. Micro-images and paper copies thereof must "exhibit a high degree of legibility and readability". Legibility is defined as "the quality of the letter or number that enables the observer to identify it positively and quickly to the exclusion of all other letters or numerals". Readability is "the quality of a group of letters or numerals being recognizable as words or complete numbers". Agencies microfilming permanent public records should comply with the following ANSI standards. These standards relate to preparing and filming permanent records and the use, storage and inspection of film: ANSI PH1.25-1984, ANSI PH1.28-1984, ANSI PH1.41-1984, ANSI PH1.43-1983, ANSI PH4.8-1985, ANSI PH5.8-1972, ANSI/AIIM MS19-1978 and ANSI/AIIM MS34-1985.

 

d) The background photographic densities must be appropriate to the type of documents being filmed.

 

1) Background densities must be as follows:

 

Classification

Description of Documents

Density

Group 1

High-quality, high-constrast printed books, periodicals, and black typing.

1.30-.50

Group 2

Fine-line originals, black opaque pencil writing & documents with small high-contrast printing.

1.15-1.40

Group 3

Pencil & ink drawings, faded printing & very small printing, such as the footnotes at the bottom of a printed page.

1.00-1.20

Group 4

Low-contrast manuscripts & drawings; graph paper with pale, fine-colored lines; letters typed with a worn ribbon; & poorly printed faint documents.

0.80-1.00

Group 5

Although not a general practice, some poor-contrast documents may require a lower background density. (i.e., photostats & blueprints, etc.)

0.70-0.85

Group 6

Computer-Output Microforms (Full Reversal Processing)

1.50-2.00

 

2) The base-plus-fog density of unexposed, processed, clear based film must not exceed 0.10. When a tinted-base film is used, the density will increase by 0.10 or 0.20, which must be added to the 0.10 value.