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Thread: Help measuring Film

  1. #1
    Donor daniboyweb is on a distinguished road
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    Help measuring Film

    Hello.

    I have some doubt about how can I measure my output film without densitometer (for flexographic use). I have a very old one and I want to know if there is a software that works like vipflex with a microscope cam ( http://www.xrite.com/product_overview.aspx?Action=support&ID=797 ).

    I think maybe this can be hacked, but I really don't know how or maybe there is another one like it but free.

    Thanks a lot!

    Daniel.

  2. #2
    PRC Member johnlongthomas is on a distinguished road
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    I have tried this. It is a headache. Better to buy a transmission densitometer. Used ones are cheap on ebay

  3. #3
    Donor daniboyweb is on a distinguished road
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    the thing is, I need something like this, the density of my laser is not the same tan before, so I need to user more power, and to calibrate i need to know the diameter of the dot.

  4. #4
    Donor Shap will become famous soon enough
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    Film measurement with USB microscope

    In Drupa 2012 I saw new, inexpensive digital USB camera/microscopes that were offered with print oriented software for Windows.
    Different models with different software tools for different segments of the printing industry.
    Dot size measurements, as well as Screen Ruling (LPI), Dot Area (%), Angle and more where common.
    Just to give you an idea, I google'd and found this (value added) seller:
    http://www.tcbvba.be/DinoLite.htm
    Nowadays, high resolution monochromatic cameras are cheap but a good stand is needed, as well as dedicated software, so expect wide differences in price/value between available models.
    If you actually go out and buy one, please post your comments.

  5. #5
    Donor daniboyweb is on a distinguished road
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    I already have one of those cheap microscope cameras, but none of those software was for reading dot size or lpi....

    I'll search more about it...

    Quote Originally Posted by Shap View Post
    In Drupa 2012 I saw new, inexpensive digital USB camera/microscopes that were offered with print oriented software for Windows.
    Different models with different software tools for different segments of the printing industry.
    Dot size measurements, as well as Screen Ruling (LPI), Dot Area (%), Angle and more where common.
    Just to give you an idea, I google'd and found this (value added) seller:
    http://www.tcbvba.be/DinoLite.htm
    Nowadays, high resolution monochromatic cameras are cheap but a good stand is needed, as well as dedicated software, so expect wide differences in price/value between available models.
    If you actually go out and buy one, please post your comments.

  6. #6
    Donor Shap will become famous soon enough
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    Scan and use Photoshop to measure

    A workaround solution that may work:
    Take a sharp, contrasty, high res scan with your digital microscope (for film scanning you must use transmitted light), open in Photoshop, convert to Bitmap mode (1bit tiff) and measure the size of your dots with the Ruler tool.
    Using the exact same setup you should also scan a subject of known dimensions to calibrate (find the scale) of your imaging setup.
    You should keep the exact same setup for subsequent scans; repeatability is a must for comparable results.

    Tell us if this worked for you.

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  8. #7
    Donor daniboyweb is on a distinguished road
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    I had used something like that, but if you try to calibrate something will take hours (tons of numbers to calculate)

    Quote Originally Posted by Shap View Post
    A workaround solution that may work:
    Take a sharp, contrasty, high res scan with your digital microscope (for film scanning you must use transmitted light), open in Photoshop, convert to Bitmap mode (1bit tiff) and measure the size of your dots with the Ruler tool.
    Using the exact same setup you should also scan a subject of known dimensions to calibrate (find the scale) of your imaging setup.
    You should keep the exact same setup for subsequent scans; repeatability is a must for comparable results.

    Tell us if this worked for you.

  9. #8
    Donor daniboyweb is on a distinguished road
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    http://www.xrite.com/product_overview.aspx?ID=797&Action=support&Softwa reID=853

    Demo mode:

    License Number: 0052
    Password: 2284-0887-2175-2585

    Maybe someone know how to inject an image to the demo files, so we can use the microscope image in the injection.

    Thanks

  10. #9
    Donor Shap will become famous soon enough
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    FlexoPerfection can Measure Dot Area

    If you need Dot Area values you can use FlexoPerfection on your 1Bit tif scan.

    Even the Demo version can be used (cracked version can also be found here).

    Use these values with caution - I remember some where wrong for me.

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