SURFACES OVER/ADD BLEND MODE MADMAPPER4
  • azimutstudio
    junior Member
    Posts: 3
    Joined: Tue Apr 27, 2021 2:42 pm

    SURFACES OVER/ADD BLEND MODE MADMAPPER4

    by azimutstudio » Tue Apr 27, 2021 4:09 pm

    Hello,

    I would like to simply project a video loop (place in Quad-2 with blend mode set to Add or Over) with a any background generators, materials or videos (place in Quad-1)
    The desire behavior is to see the content of the video clearly with the black video background replaced by the content set in Quad-2. Like a whatever video editing software, instead I see the content of the video in semi-transparency

    I searched on internet but I founded only YouTube channel tutorial related MadMapper3. I tried it but in MadMapper4 the result is different. The black color of background in video is transparent (and this is ok) but the rest of video content is semi-transparent and I glimpse the Quad-1.

    I also did a test with only built-in generators:
    - Quad-2 ColorPatterns (blend mode set to Add or Over, I tried whole blend modes)
    - Quad-1 TestCard
    The result is the same. I glimpse testCard image where there is ColorPatterns.

    How can I obtain the result like a whatever video editing software?

    Thanks!
  • franz
    madMapper master
    Posts: 889
    Joined: Fri Feb 18, 2005 7:05 pm
    Location: Paris, France
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    Re: SURFACES OVER/ADD BLEND MODE MADMAPPER4

    by franz » Wed Apr 28, 2021 10:48 am

    to remove the black background from your foreground video,
    either use an alpha channel and compliant codec such as hap-alpha
    or apply the luma key filter and key out the black values.
  • azimutstudio
    junior Member
    Posts: 3
    Joined: Tue Apr 27, 2021 2:42 pm

    Re: SURFACES OVER/ADD BLEND MODE MADMAPPER4

    by azimutstudio » Wed Apr 28, 2021 2:21 pm

    to remove the black background from your foreground video,
    either use an alpha channel and compliant codec such as hap-alpha
    or apply the luma key filter and key out the black values.
    Thank you Franz. But my problem is more simple I think. The background is already removed and this is ok.
    But is the foreground the issue. I see the surface below.
    Which is the correct blend mode to show the foreground of the last surface (Quad-2)?

    In attached there are 2 example of the problem.

    Thank you.
    Roberto.
    Attachments
    screen2.png
    screen2.png (264.74 KiB) Viewed 189 times
    screen1.png
    screen1.png (182.39 KiB) Viewed 189 times
  • franz
    madMapper master
    Posts: 889
    Joined: Fri Feb 18, 2005 7:05 pm
    Location: Paris, France
    Contact:

    Re: SURFACES OVER/ADD BLEND MODE MADMAPPER4

    by franz » Thu Apr 29, 2021 11:04 am

    you should use over blend mode then.
  • azimutstudio
    junior Member
    Posts: 3
    Joined: Tue Apr 27, 2021 2:42 pm

    Re: SURFACES OVER/ADD BLEND MODE MADMAPPER4

    by azimutstudio » Thu Apr 29, 2021 6:08 pm

    you should use over blend mode then.
    Thanks Franz, But:
    - If I use OVER blend mode I can't view in the background color the surface below.
    - If I use ADD blend mode I can't view clearly the foreground of surface Quad-2 it is in semitransparent.
    Attachments
    Over.png
    OVER Blend Mode
    In Over Blend Mode I can't see the surface Quad-1
    Over.png (378.5 KiB) Viewed 155 times
    Add.png
    ADD Blend Mode
    In Add Blend Mode the circle rainbow is semi transparent. I would like to see it in full color and full opacity
    Add.png (288.39 KiB) Viewed 155 times

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