Analog Fm Screening

I've been using FM screening inward presswork since 1970 (kindergartens were rattling sophisticated dorsum as well as therefore :-)). This was agency earlier PhotoShop, personal computers, as well as digital workflows. The method I used was fairly simple, but hard to perfect.

I would accept a conventional depression contrast 35mm dark as well as white (or coloring slide) positive image.

I would as well as therefore house the slice of celluloid inward my enlarger inward the darkroom.

Then I would projection the picture through a slice of frosted drinking glass that had the frosted side inward contact amongst a slice of lithographic film.

Lithographic celluloid does non tape greyness levels - only dark as well as white. It is the same celluloid that printers purpose to bring out their printing plates.
The petroleum surface of the frosted side of the drinking glass acted similar a digital threshold array as well as broke the picture into a random halftone designing where the frequency of the dots (and to a lesser extent their size) represented the dissimilar greyness levels of the master copy image.

The coarseness of the frosted side of the drinking glass determined how coarse the resulting "FM" hide was.

The concluding consequence was a slice of negative celluloid that my printer would strip into the the task as well as purpose to post away the printing plate.

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