SUBTITLE C: GOVERNMENTAL RECORDS
CHAPTER I: LOCAL RECORDS COMMISSION
PART 4000 LOCAL RECORDS COMMISSION
SECTION 4000.60 MINIMUM STANDARDS OF QUALITY FOR PERMANENT RECORD PHOTOGRAPHIC MICROCOPYING FILM
Section 4000.60 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. No incorporation by reference in Section 4000.60 includes any later amendments or editions.
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. Microimages and paper copies thereof must "exhibit a high degree of legibility and readability." Legibility is defined as "the quality of a 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 filming public records before disposal of the originals must comply with the following ANSI standards relating to preparing and filming of records and the use, storage and inspection of developed 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-R1978, and ANSI/AIIM MS19-1978.
d) The photographic densities must be appropriate to the type of documents being filmed.
1) Appropriate background densities are as follows:
|
Classification |
Description of Documents |
Background Density |
|
Group 1 |
High-quality printed books, periodicals, and dense typing.................................. |
1.10-1.40 |
|
Group 2 |
Fine-line originals, letters typed with a worn ribbon, pencil writing with a soft lead, and documents with small printing.......................................................... |
1.00-1.20 |
|
Group 3 |
Pencil drawings, faded printing, graph paper with pale, fine colored lines, and very small printing............................... |
.90-1.10 |
|
Group 4 |
Very weak pencil manuscripts and drawings, and poorly printed, faint documents.......................................... |
.80-1.00 |
|
Group 5 |
Some poor-contrast documents may require a lower background density (i.e. photo-stats or blueprints, etc........ |
.70-.90 |
|
Group 6 |
Computer-Output Microforms............ |
1.50-2.00 |
2) The base-plus-fog density of unexposed, processed, clear based microfilm must not exceed 0.10.
(Source: Amended at 15 Ill. Reg. 11932, effective August 6, 1991)