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Frequency Separation without the Contrast Group

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  • Frequency Separation without the Contrast Group

    Hello.

    Is there a way to do Frequency Separation without utilizing the Contrast Blend Modes Group?

    Due to the nature of editing I am doing using standard Frequency Separation techniques leads to unpleasant ghosting/ringing/halo type artifacts that build up with every step. Specifically, both the Gaussian Blur/High pass filter type Frequency separations "move/diffuse" the pixels ever so slightly and then the Contrast Blend modes accentuate that effect further by propagating it up and down the layer stack.

    Is it possible to isolate the high frequency and the low frequency details on separate layers and have them stacked in a regular pass-through stacking modes, such as normal or the difference group? I want to have higher layers not interact with lower layers and vise versa.

    I have attempted to do such extractions using the difference blend modes group "isolating" the details and placing them on top of an image that had the details subtracted away. However, the detail selections and the tone selections always seem to be partial in nature so the image looses it's full opacity and one can "see thought the image" down to the background layer. Turning off the background layer reveals the partial nature of the image and both details and tones look "ghostly". Repeating the process builds up the opacity but is very cumbersome.

    Any advice?

    Thank you very much.

    Eliot

  • #2
    Re: Frequency Separation without the Contrast Grou

    Seems like you are the only one in the whole world having this problem. Doing it right should help.

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    • #3
      Re: Frequency Separation without the Contrast Grou

      Haloing happens when you use gaussian blur. I would just drop the use of frequency separation, as it doesn't help much anyway. Your described attempts to fix this are over-engineered. I would never do something like that, because even if I can get that kind of nonsense to work on a test case, it's likely to break later on some other image.

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      • #4
        Re: Frequency Separation without the Contrast Grou

        If you some use more sophisticated blurring than Gaussian Blur then most of the issues are resolved.

        You can try Surface Blur or follow Nino Batista's method:

        https://www.youtube.com/watch?v=7r3Zvpdbw98
        Last edited by Drazick; 10-01-2017, 08:15 AM.

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        • #5
          Re: Frequency Separation without the Contrast Grou

          Originally posted by Sabrina81
          Interesting how you managed to answer "yes" and still give OP tutorial with contrast blending mode.

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          • #6
            Re: Frequency Separation without the Contrast Grou

            Originally posted by Tulack View Post
            Interesting how you managed to answer "yes" and still give OP tutorial with contrast blending mode.
            Happy now?

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