Re: ATM "Focaultgrams" images

[Donald Clement <clement@cqt.com>]

Another method may be to scan the photo or use a ccd image.  Photoshop has an
unsharp masking filter that essentially performs the same function in software
as described below using film and negative.

Donald Clement

> Jeff Baldwin wrote:
>
> Unsharp masking pulls details out in the texture of you polish.  You take
> an overexposed black and white image of your Foucault shadowgram.  You then
> place a thin sheet of plate glass between the negative and another
> unexposed film.  Using a non-point light source you expose the negative
> onto the film to make a slightly out-of-focus positive.  When the tow are
> combined the result is that the out-of-focus positive will wipe out or
> neutralize the image's general brightness level leaving only distinct
> changes in intensities on both the bright areas and the dark areas of the
> picture.