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  1. #1
    Premium Member
    Andymac's Avatar

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    Default haftones, contrast range and mesh count



    I was looking through old pics and found one of this test film I have.

    It might be hard to tell from this, but what it is is progressively higher line counts of halftones. You burn this on your screen, and it shows what line count prints best.

    What those darker outlines in steps are is suggested mesh counts for the various halftone LPI counts, but also showing the reduced contrast range

    What happens when you expose this film on mesh and then print it, you immediately see the drop out at the bottom end of 5% lights, and the filling in at the top end of 95% darks.

    It shows you pretty clearly what you can hold on your exposing and printing system, and Dr Moire appears where there is a math mismatch with line count and mesh count.

    None of this really matters if you are just banging out some raw coarse halftones, especially just black. But if you are trying to print some serious 4/c process, you need to be able to print the widest possible contrast range, and not lose it during the run, because this will cause weird color shifts when the other colors go down.

    Like Richie said, one of the key issues is how high a line count you have/need, which is determined by viewing distance - its better to print coarser and keep your range and all the dots, than to force it and lose them.
    Andymac

    services www.squeegeeville.com
    equipment www.tmiscreenprinting.com

    Todo es empezar.

  2. #2
    andydiesel's Avatar

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    Default

    so you think we are all so drunk the only way we could read this is upside down?

  3. #3
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    Andymac's Avatar

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    Default

    4:20 baby
    Andymac

    services www.squeegeeville.com
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    Todo es empezar.

  4. #4
    andydiesel's Avatar

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    Default

    we used to run 420 mesh.

    it popped a lot.

  5. #5
    B-DROID's Avatar

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    Default

    Quote Originally Posted by andydiesel View Post
    we used to run 420 mesh.

    it popped a lot.

    It bet you it burned nice though.

  6. #6
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    Andymac's Avatar

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    I drank Shaftsbury 420 beer last night. And a sampling of tequilas. I don't know about popping, but I was feeling like puking for a bit.
    Andymac

    services www.squeegeeville.com
    equipment www.tmiscreenprinting.com

    Todo es empezar.

  7. #7
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    Nicholas Wilson's Avatar

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    Default

    did you like this halftone test sheet better than the one in the premium section?
    The Half and Half
    Now Selling Speedball Ink for all your East Coasters.

  8. #8
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    Nicholas Wilson's Avatar

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    and just realized that that is an exposure test, not halftone.

    ugh, 4.20 is off to a good start.
    The Half and Half
    Now Selling Speedball Ink for all your East Coasters.

  9. #9
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    Andymac's Avatar

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    Default

    this is a good one for determining what halftone line count you can carry on a given mesh.

    the other one, you would have to output it at a few different line counts then burn them all at once.

    wish I had picked up more copies of this when I saw it. the guys are probably out of business now. Old school film guys, with nothin' better to do than smoke reefer all day.
    Andymac

    services www.squeegeeville.com
    equipment www.tmiscreenprinting.com

    Todo es empezar.

  10. #10
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    NeroInferno's Avatar


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    Default a good scan

    Hi Andy,
    can you make a good scan of it into a pdf and upload it here or on Raclando?

    So the people can re-print it and use it?

    Bye bye,
    Fabio

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