Developer for spatial frequency

Discussion in 'Alternative Processes' started by Mustafa Umut Sarac, Aug 16, 2011.

  1. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    Is there a development technique which contrast change with the spatial frequency of the image ?

    Thank you ,

    Umut
    Istanbul
     
  2. Monito

    Monito Member

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    High acutance developers.
     
  3. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    Monito , thank you. Could you please give mea brief on how they are working parallel to difference on lp/mm per image part ?

    Umut
     
  4. Monito

    Monito Member

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    "difference on lp/mm per image part" makes no sense in relation to your question about contrast change.

    A lens may resolve more line pairs in the center than the edge, but a developer is not going to fix that.

    Your original question as phrased seemed to be more about things like the Einstein / Marilyn picture combination. A high acutance developer enhances edges (high spatial frequency) but it doesn't actually make it sharper, only apparently sharper.

    Digitally you can make an image have low overall contrast and high microcontrast or vice versa.
     
  5. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    My main interest is to change MTF curve of a negative. If I am not wrong , MTF curve documents low to high lp/mm of image and its contrast.
    Is it possible to change low and high lp/mm high contrast , middle lp/mm to lower contrast like Leica lenses.
    Thats why a nude woman at night looks whiter , her hairs glow but her criss cross shirt seems lower contrast.

    Umut
     
    Last edited by a moderator: Aug 16, 2011
  6. Monito

    Monito Member

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    You can't get something for nothing.
     
  7. Alan Johnson

    Alan Johnson Subscriber

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    Here is included a discussion of developer effect on film MTF curve:
    http://www.normankoren.com/Tutorials/MTF1A.html
    The adjacency effect in a dilute one shot developer is visible on the red line at low frequency.
     
  8. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    Thank you very much Alan.