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Thread: percentage?

  1. #1
    sky753 is offline Senior Member
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    Default percentage?

    Hello Everyone,

    The following is taken from BSH glass printing requirements. One sentenc I am totally confusted. Hope you can offer your replies here!

    All dots of the imprint must be in place.
    10 % of the dots may have 25 % of the target print area.
    5 % of the dots may have up to 50 % of the target print area,
    accumulated on a maximum area of 50 x 50 mm.
    What does the underlined mean here?

  2. #2
    BobK's Avatar
    BobK is offline Harmless drudge
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    Default Re: percentage?

    Quote Originally Posted by sky753 View Post
    Hello Everyone,

    The following is taken from BSH glass printing requirements. One sentenc I am totally confusted. Hope you can offer your replies here!

    All dots of the imprint must be in place.
    10 % of the dots may have 25 % of the target print area.
    5 % of the dots may have up to 50 % of the target print area,
    accumulated on a maximum area of 50 x 50 mm.

    What does the underlined mean here?
    This is a specification of the quality of the printing. Look closely at a black and white newspaper photograph (a 'half-tone') and you'll see thousands of little dots. If the picture meets a specified quality, the size of the dot - near enough, within the tolerance of the spec. - is the same as 'the target print area'. Lots of big dots trick the human eye into seeing that part of the picture as black.

    In your case, 85% of the dots must be at or very close to the target print area. 10% of them can be between 75% and 125% of the target area. And 5% of them can have between 50% and 150% of the target print area. (I'm guessing here, but I think there's a "" missing). And this quality standard must be maintained throughout a square 50mm X 50mm (that is, a big picture doesn't meet the spec. if most of it is perfect but a square that small is substandard).

    I don't know how this would translate to glass printing, but presumably the principles are the same.

    b

  3. #3
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    Default Re: percentage?

    10% of the dots may or may not cover 25% of the target print area.

    whereas the 5% of the dots may cover the 50% of the target print area.
    i am not a teacher

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