Message-Id: <199702041515.JAA07265@library.wustl.edu> Date: Tue, 4 Feb 1997 10:10:11 -0500 From: Peter Hirtle <mailto:pbh6@CORNELL.EDU> Subject: Re: Resolution Standards and Procedures for To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
See the excellent discussion of resolution charts in Anne R. Kenney and Stephen Chapman, "Tutorial: Digital Resolution Requirements for Replacing Text-Based Material: Methods for Benchmarking Image Quality," published by the Commission on Preservation and Access in April, 1995. They note that ANSI/AIIM MS44-1988, "Recommended Practice for Quality Control of Image Scanners," advises against using IEEE Std 167A-1987 when scanning at below 600 DPI. Cornell has determined that for monographs, serials, and other text-based publications 600 dpi bitonal scanning is sufficient to capture most of the information they contain. The RIT Alphanumeric Test Object and AIIM Scanner Test Chart #2 are used for measuring resolution.Further information on the procedures used for measuring image quality can be found in the same authors' "Digital Imaging for Libraries and Archives," published by the Dept. of Preservation and Conservation, Cornell University, in June, 1996.
______________________________________________ Peter B. Hirtle Manager, Digital Access Coalition phone: 607/255-3530 2B Kroch Library fax: 607/255-9524 Cornell University e-mail: mailto:pbh6@cornell.edu Ithaca, NY 14853-5302 ______________________________________________ All opinions expressed are my own, and not those of my employer.
At 9:49 AM +0100 2/4/97, Levine Emil wrote: >Colleagues,
>
>Here at the UN/IAEA/INIS in Vienna we will begin to scan (1,500,000 pages a
>year) documents previously put on microfiche. Using microfiche, of course,
>we film a resolution chart (NBS SRM 1010-A) and measure the resolution using
>a microscope.
>
>At the AIIM meeting last year I asked many time what is the equivelant test
>for scanning, and never got an answer. I plan to scan the IEEE Std 167A-1987
> and determine the smallest point size I can read, and .resolution chart
>(NBS SRM 1010-A), this does not really give a true reading of resolution, as
>this becomes a factor of the display system and laser printout. We will scan
>at 240 DPI and use the images for CD-ROM and also to make raster scan com
>microfiche.
>
>Does anyone have a procedure for determining the resolution achieved in
>scanning and on raster scan COM. Any new standards covering this?
>
>Emil Levine
>Head, INIS Clearinghouse
mailto:>LEVINE@NEPO1.IAEA.OR.AT