> On Mar 28, 2018, at 11:39 PM, Fred Cisin via cctalk <cctalk@classiccmp.org>
> wrote:
>
> On Wed, 28 Mar 2018, Bob Rosenbloom via cctalk wrote:
>> This thread reminded me of a DYI scanner I had read about. Found it with
>> google:
>> http://retrocmp.com/projects/scanning-micro-fiches/235-the-homebuild-automatic-micro-fiche-scanner
>
> I like his enthusiasm and the fact that he actually got it together and DID
> it.
>
> Hmmm. If you gut the reader, and photograph the illuminated portion of the
> fiche, rather than project and photograph the screen, image quality will be a
> lot better. Ambient light will cease to be a significant issue.
>
> I don't think that ANY of them are color, so with bitonal, noise should not
> be that much of a problem, unless that is being compounded by the long
> exposure?
That sounds right for documentation microfiche such as the DEC ones.
I've run into microfiche that is somewhat similar but for a very different
purpose: the rear-projection microfiche used in PLATO terminals. Those have
square images, 256 of them (16 by 16). And they often are in color. They
were used to provide photo images to go with the bitonal (orange/black) PLATO
screens, for applications such as teaching botany.
paul
