microfilm

[Jacques Melot]

 Le 19/02/01, à 12:51 -0500, nous recevions de Dr. Gerald "Stinger" Guala :



>Of course there are commercial conversion services but the easiest and most
>inexpensive way (if you don't have thousands of pages) would be to use a
>film scanner.  There are several that are built for large format negatives
>and should work,



    « should » !, mais en réalité, non ! Les numériseurs à
diapositives Agfa, Nikon, etc., ne fournissent pas de bons résultats,
même à 2700 dpi.

    Pourquoi ? Parce que la source lumineuse est trop diffuse (pas
assez dure) : il faudrait une source ponctuelle.

    Jacques Melot



>at worst you could use something like an Agfa Duoscan T1200
>which will scan an 5"X7" negative (probably bigger, that's just as big as we
>have done on it) at 1200 dpi native and interpolate much farther.
>
>Gerald "Stinger" Guala, Ph.D.
>Keeper of the Herbarium
>Coordinator of the Program in Tropical Plant Systematics
>Fairchild Tropical Garden Research Center
>11935 Old Cutler Rd.
>Coral Gables, FL 33156-4299
>
>www.virtualherbarium.org
>
>-----Original Message-----
>From: Taxacom Discussion List [mailto:TAXACOM at USOBI.ORG]On Behalf Of
>Jacques Melot
>Sent: Monday, February 19, 2001 10:26 AM
>To: TAXACOM at USOBI.ORG
>Subject: Re: microfilm
>
>
> Le 19/02/01, à 10:08 -0500, nous recevions de Robin W. Scribailo :
>
> >Dear Taxacom,
> >
> >We are trying to find out the best (most inexpensive with the best
> >resolution) way to convert hundreds of pages of microfilm to digital pages.
> >Is there any way to use the microfilm reader to project the image directly
> >onto a scanner bed? I'm sure there is probably a very expensive machine
> >that does this for you as well. The microfilms are copies of the original
> >land surveys for counties which we are tracing vegetational changes.
> >Any help from those with ideas or experience in this would be greatly
> >appreciated.
>
>
>
>    Même question pour les microfiches (IDC, etc.)!
>
>    Jacques Melot
>
>
>
>
> >Robin
> >
> >Robin W. Scribailo, Ph.D.
> >Associate Professor of Biology
> >Aquatic Plant Herbarium
> >Biological Sciences
> >Purdue University North Central
> >1401 S. US 421, Westville
> >IN 46391-9528
> >(219) 785-5255
> >FAX (219) 785-5483