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Any help with Stochastic (FM screen) Screen

Sep 11, 2008 3:18 PM

does anyone have information on how to create Stochastic (FM screen) Screen using photoshop.

Link to example

http://www.johnkyrk.com/conservatory.html

any help appreciated
614 Views   7 Replies   Latest reply: Gernot Hoffmann, Sep 14, 2008 11:34 AM
 
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  • Gernot Hoffmann
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    1. Gernot Hoffmann,
    Sep 11, 2008 9:10 PM   in reply to (MrShrek)
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    Image > Mode > Grayscale
    Image > Mode > Bitmap > Diffusion Dither + Choose ppi

    The result is printable only for very low ppi. Otherwise
    the Bitmap and the printer screening will interact and create
    Moiré patterns.

    It's perhaps Floyd-Steinberg Dithering, which is deterministic
    without a random (stochastic) component. The word 'stochastic'
    is often abused.

    Best regards --Gernot Hoffmann
     
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    2. (MrShrek),
    Sep 11, 2008 11:37 PM   in reply to (MrShrek)
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    Gernot,

    Thanks for the reply, do you know if there is a plugin available to allow me to use Floyd-Steinberg Dithering method.

    Or could you point me in a direction that may help

    Thanks

    Steve
     
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  • Gernot Hoffmann
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    3. Gernot Hoffmann,
    Sep 12, 2008 3:10 AM   in reply to (MrShrek)
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    Steve,

    sorry, don't know a plug-in.
    Once I had programmed this stuff:
    http://www.fho-emden.de/~hoffmann/hilb010101.pdf
    But I don't know how to make Photshop plug-ins.
    Please use for this doc in Acrobat 72dpi (not 96) and
    view by zoom=100% or occasionally zoom=200% (pixel-
    synchronized graphics).

    Henry R.Kang had written good books about 'halftoning'.

    Best regards --Gernot Hoffmann
     
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    4. (Phos±four_dots),
    Sep 12, 2008 6:24 AM   in reply to (MrShrek)
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    http://www.telegraphics.com.au/sw/info/rastus.html
     
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    5. (Barbara_Bradley),
    Sep 12, 2008 12:23 PM   in reply to (MrShrek)
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    Not sure if this plugin does what you want but try 'India Ink' at flamingpear.com.
    Barb
     
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  • qu1j0t3
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    6. qu1j0t3,
    Sep 14, 2008 10:48 AM   in reply to (MrShrek)
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    Floyd-Steinberg (Diffusion Dither) is useless for high resolution work.

    I have a plugin which produces a good quality stochastic for lithography or contact printing: http://telegraphics.com.au/sw/#rastus

    Demo downloadable there, or contact me if you want to evaluate it.
     
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  • Gernot Hoffmann
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    7. Gernot Hoffmann,
    Sep 14, 2008 11:34 AM   in reply to (MrShrek)
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    My rather good RIP ColorGate ProductionServer
    offers Floyd-Steinberg as one of several options
    for halftoning.

    Again: books by Henry R.Kang about halftoning...

    Best regards --Gernot Hoffmann
     
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