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Activity Forums DaVinci Resolve Issue with using Luma Keyer on an adjustment clip

  • Issue with using Luma Keyer on an adjustment clip

    Posted by Catalin Buda on February 5, 2024 at 7:37 pm

    Hi

    I posted this on the Blackmagic forums as well, but I didn’t get any answers.

    And I’ve also encountered this issue with Premier Pro and AfterEffects as well.

    So, here’s the problem: Luma Keyer doesn’t behave as expected when placed on an adjustment clip. Let me explain: let’s say I have this clip on a track:

    (please take a look at the first image I attached, as it seems I cannot place it here)

    If I duplicate this clip, place the duplicated clip on another track above the original clip and insert a Directional Blur effect and a Luma Keyer on this second clip I get this:

    (second image)

    Which is exactly what I expect: the Luma Keyer makes certain zones of this second clip transparent. Or, in other words, Luma Keyer enables me to have the directional blur only on some parts of the frame.

    And now comes the problem. If instead of duplicating the original clip I place an adjustment clip above the original clip and insert on this adjustment clip a Directional Blur and a Luma Keyer (exactly as before, with the same settings) I expect to get the same result, but instead I get this:

    (third image)


    As you can see, all the areas that should be transparent are black.
    Why is that? Any thoughts?

    Cheers!

    Catalin Buda replied 2 months ago 3 Members · 4 Replies
  • 4 Replies
  • Michael Gissing

    February 6, 2024 at 7:04 am

    The luma keyer is probably working but you still need the second duplicated clip underneath. Otherwise you are looking at black

  • Riccardo Luppi

    February 6, 2024 at 7:50 am

    What Michael is suggesting is partially correct: the luma keyer on the adjustment clip is blurring certain areas and mixing them with the black underneath. The issue is that even if you duplicate the clip, that won’t solve your issue as the adjustment clip affects all video lines beneath it. In short, the luma keyer is not ment to be used on an adjustment layer.

    My personal suggestion would be, if you want to avoid having the duplicate clip in the timelines and also be able to easily edit the clip (or replace it) to use it either in the fusion page or even better in the color page.

  • Catalin Buda

    February 6, 2024 at 10:24 am

    Thanks guys for your input!

    Meanwhile I discovered a pretty simple method to accomplish this by editing the adjustment clip in Fusion, like this:

  • Catalin Buda

    February 6, 2024 at 10:26 am

    And somebody suggested an even simpler method using the color page on the Blackmagic forum:

    https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=196075

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