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Negative vs Positives

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  • Negative vs Positives

    Can someone shed some light into the following.

    We still make film and always calibrate using negatives, we tried to calibrate with a postivie and there is quite a difference between the measurement of the Negs and Positive.

    Is there a logical reason why this is?

    Example: Neg 50% at 53 Positive 50% at 58 Neg 60% at 62 Positive 60% at 67


    Using Harlequinn Rip.


    Thank you in advance for any info.



  • #2
    Just so I better understand, you are using the same film but the imagesetter exposing polarity is being changed?
    If you corrected the calibration on negative film 50=50, then output positive does it get better?
    Steve Suffoletto

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    • #3
      Hello Steve,


      Thanks for asking. Have not gotten it to a 50=50 we usually just go with a 50% + or - 2%.

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      • #4
        Oh! I had that too, yonks ago. The cause was that the calibrations Strip was set with a round dot screen, better would be a euclidian as it should have a perfect checker-board at 50% if your callibration is correct.

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