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Thread: Beta Screen co. ??? what is it!

  1. #1

    Join Date
    Jul 2000
    Posts
    195

    Beta Screen co. ??? what is it!

    Hi All, I recently came across this 4" by 6" negative looking thing with all kin ds of calibrations on it in a camera store. It has Beta Screen co. printed on it and also spread guide, and it says avalible lines 60, 65, 85, 100, 110, 120, 13 3, 150. Can someone tell me what this is and how it is used. Thanks, David

  2. #2

    Join Date
    Jan 2001
    Posts
    128

    Beta Screen co. ??? what is it!

    A little hard to tell, but it might be a device used in the printing industry to determine the DPI of halftones. Those numbers you listed are the standard DPIs they use.

  3. #3

    Join Date
    Nov 1998
    Posts
    339

    Beta Screen co. ??? what is it!

    Back in the dark ages <g> halftones were made by placing a screen (actually a tr ansparency) over the original and photographing it on high-contrast material. Th e screen renders the reproduction as dots, large-to-small dots depending on the reproduced tone. A press can't print tones, just black and white or large-to-sma ll dots.

    Halftone screens are designated by coarseness; the more lines (lpi) the finer the detail that can be rendered, but that has to be balanced against what kind o f paper the halftone will be printed on and other assorted factors.

    While you can easily see the difference between a 60-line screen and a 120-lin e screen, it can be difficult to tell between say an 85-line screen and a 100-li ne-screen; what you have it the comparator you can use to determine what screen you have.

    Now I've just demonstrated how obsolete I am. <g>

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