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Thread: Alpha Black Edge

  1. #1

    Alpha Black Edge

    Is there a reason why Catalyst adds a black edge around content on 4444 files?

    It looks like aliasing on curved edges that is turned black rather than transparent.

    Cat v5 n561.

  2. #2
    show a screen capture?
    did you use non-premultiplied alpha?
    how you make the image?

  3. #3
    show a screen capture?
    did you use non-premultiplied alpha?
    how you make the image?

  4. #4
    It is straight Alpha out of C4D, ProRes 4444. I am looking at the darker edge around the DNA strand.

    Thanks,

    Screen Shot 2016-09-27 at 11.29.03.png

  5. #5
    you need to show me exactly what happens to colour and alpha channels at that point

  6. #6
    https://www.dropbox.com/sh/76hcxijjd...uQ74UV_da?dl=0

    pass: alpha4444

    File 088 is the Alpha file which is over a live camera input.

  7. #7
    Quote Originally Posted by Trench117 View Post
    https://www.dropbox.com/sh/76hcxijjd...uQ74UV_da?dl=0

    pass: alpha4444

    File 088 is the Alpha file which is over a live camera input.
    is your movie straight alpha or pre-mulitplied?

    http://www.provideocoalition.com/alp...d-vs-straight/

    and have you checked the c4D output?

    http://mograph.net/board/index.php?showtopic=28526
    "Isn't Straight Alpha better...? in C4D it renders out a little extra edge of the colour of the object so when you bring it into AE there's less chance of getting black edges where transparency should be. Correct me if I'm wrong."

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