Latest post Thu, Nov 8 2018 8:41 AM by BenoitM. 2 replies.
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  • Wed, Nov 7 2018 5:44 PM

    • BenoitM
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    ideas for this geometric distortion effect

    Hi...here another quest for suggestions for a 'how to'...

    I would like to stretch a picture in non-linear fashion, like what some older 16:9 TV sets could do with 4:3 sources, i.e. stretch more in the sides and less in the center to keep the center of the picture less distorded while filling the whole wide screen. Much like the exact opposite of a cylinder effect...

    I have experimented with BCC's lens correction, but I couldn't tweak it to avoid unwanted distorsion either.

    Suggestions ?

    (actually I need to fit a standard 16:9 HD frame into a 1080 x 820 (approx. 2.35:1) canvas and try to fill it as much as possible without excessive h/v distorsion)

    MC 2018.9 (Symphony option)/BCC 10.0.5/RED 5.6; BlackMagic Ultrastudio Mini Monitor (10.11.2.0); DELL Precision 5530 - Intel Core i7-8850H 2.6 GHz - 32... [view my complete system specs]
  • Thu, Nov 8 2018 6:46 AM In reply to

    • DStone
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    • Moderator: Media Composer Getting Started

    Re: ideas for this geometric distortion effect

    I had a TV like that. After watching it that way for a while, I turned it off. It's really odd when people get fatter when they walk off the edge of the screen.

    What you're looking to do is actually a logarithmic stretching (the farther way from the center, the more pronounced the effect). It's been a long time since the I had that TV, but I do remember that about the middle 30% was pretty flat.

    About the only thing that comes to mind is to use the BCC Layer Deformer. This takes a grayscale image and uses that to deform another layer. You can selectively alter the shape of your video, but you have to figure out how to create the grayscale image to begin with.

    DIY quad core I7-4790K, 32Gb, NVidia GTX 970 4GB, Win 10 Pro, MC(generally the latest or the one just before), MC 7.x [view my complete system specs]

    Dave S.

  • Thu, Nov 8 2018 8:41 AM In reply to

    • BenoitM
    • Top 100 Contributor
    • Joined on Fri, Nov 4 2005
    • Brussels, Belgium
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    Re: ideas for this geometric distortion effect

    DStone:
    About the only thing that comes to mind is to use the BCC Layer Deformer.

    Good suggestion, I will give it a try; the content of the clip allows for some distorsion (no people Smile)

    MC 2018.9 (Symphony option)/BCC 10.0.5/RED 5.6; BlackMagic Ultrastudio Mini Monitor (10.11.2.0); DELL Precision 5530 - Intel Core i7-8850H 2.6 GHz - 32... [view my complete system specs]
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