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Problem importing .tga sequence
When I try and import my .tga animation from 3dmax into After effects I can not get the background and foreground to render simultaneously. If I leave invert alpha unchecked I get the foreground, when I check invert alpha I get the background.
I eventually want to make a .flv or .swf file but there is some weird lines along the horizon where the background and foreground meet. That is what lead me here now.
Is my 3dmax render settings wrong?
How do I get both foreground and background to import?any help would be great! thanks guys and gals!
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6 Replies
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I’m having difficulty picturing your problem exactly. How is your timeline laid out?
One thing to try, as you say you’re getting a line where FG & BG meet, is to set the Blend Mode of the FG to Alpha Add. Hopefully this will take away that alpha seam.
Cheers,
BenCurious Turtle Professional Video
Training | Editing |Support -
That sounds like a possibility. I’ll have to look in to that when I get a chance. Here is a link to a frame of the video if that helps at all.
https://crmusic.info/problem.html
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In response to Ben, unfortunately changing the blending option of the layer did not correct the problem. It changed the color of the line but little else. In my comp view I have to set the channel view to RGB Straight to see both the background and foreground. Is that normal?
In response to Dave, that is a very good thought. I did not however plan to use this on NTSC devices, although I probably should have, so the framerate default of 30 is correct for my render.
Thanks again for the reply’s. I’ll have to render up some beers for you guys later!
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No, that’s not normal — set it back.
Try reinterpreting the footage to ignore the alpha.
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Excellent that worked perfectly. When I ignore the alpha channel the foreground and background are both visible and there is no lines in my animation. I just hope when I really want that alpha channel this doesn’t come up again, but that is for another day! Now I just need to figure out why my .swf files eat up all my ram.
Thanks for the great help Steve, let me know if I can render you up a beer for your troubles 🙂
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Next time you’re in Toronto, drop me a line!
Alpha tricks:
– In 3d apps (in my experience), when you set a background to a colour, unless that background is actually an object, it will have an alpha of zero. This means that in an alpha-aware app such as AE, you can choose to make that BG disappear by interpreting as straight alpha or premultiplied alpha.
– Technically, it’s straight/premultiplied RGB, but that’s getting deep. Everyone calls it “alpha”.
– If you have a funny-coloured edge (e.g. orange) around the objects (as you did), but you want to kill the BG (make it transparent), interpret alpha as “ignore” to see the BG (e.g. orange). Re-interpret as “premultiplied”, but use the eyedropper in the dialog to choose the colour for premultiplication — choose the BG colour that you can see in the image. You might have to have a footage window open to see that. Hit OK or whatever.
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