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Compositing videos with white background
Hi! im new here, just because of one problem…
ok, so i got this blood effect footage from detonationfilms.com…
i placed them into the timeline, above my clip, then used the “multiply” compositing mode.
then after applying the compositing mode, i went to pan/crop to resize the footage…but the cropping seemed to mask the video under it. i then saw that the multiply compositing effect had (mask) written on it.
is there any way to multiply without the masking? any help would be appreciated!
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4 Replies
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I’m not sure what yu are doing wrong. When you place the blood-footage on track 1 and the video on track 2 and set the MODE for track 1 at MULTIPLY, the white background becomes transparant (the normal multiply function).
When you now crop track 1 with the event pan/crop tool, this does not affect the video at track 2. So maybe you can add a screenshot of your project to show what you are exactly doing
Theo
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Does the blood fx footage have an alpha channel? If so, you should enable that in the media properties and not change the composite mode at all. If not, the Multiple (Mask) mode is meant for a black & white alpha mask. If you don’t have one you probably should not be using this mode directly on the footage (which is not a mask) although the white will become transparent like a mask but the blood might fade.
You could use the Mask generator to try and make a mask out of a duplicate of the blood footage. Without know what the footage looks like, it’s hard to make a recommendation. Can you post a screen shot?
~jr
http://www.johnrofrano.com
http://www.vasst.com -
sorry, all links :\
ok i uploaded them in order…Looks normal at first…
https://i985.photobucket.com/albums/ae338/LegendEffects/Sony%20Vegas%20Pro%209/normal.jpgBut then…
https://i985.photobucket.com/albums/ae338/LegendEffects/Sony%20Vegas%20Pro%209/nowcropping.jpghttps://i985.photobucket.com/albums/ae338/LegendEffects/Sony%20Vegas%20Pro%209/wtf.jpg
maybe its because of this?
https://i985.photobucket.com/albums/ae338/LegendEffects/Sony%20Vegas%20Pro%209/lookeehere.jpg -
OK, now I understand what is going wrong:
When you start, the area of the blood event is the same size as your video. When you zoom-in on the blood, the whole screen will be filled with the white event and the blood. So still no problem. But what you do is to zoom-out. And then the area of the blood-event is smaller than your video below. So you introduce a black area in the blood event. And that indeed masks the event below because of the multiply mode.
You better do what John already suggested:
Add your video on the lower track. Add the blood-event twice, on two tracks above the video. Add the secondary color correction tool to the upper blood event and set the saturation to zero. Also add the mask generator tool to the upper track, choose the luminance option and select INVERT. Set the uppertrack mode to multiply (MASK) and make the middle track (also with the blood event) a child of the upper track. That gave the best results to me. (see picture)
Unfortunately, the footage you downloaded does not contain an alpha channel. Introducing an alpha channel with the secondory color correction tool is possible, but it looked awfull. So the problem with zooming-out remains.
One possible solution to this problem is: Open a new project, set the event with the blood on track 1, and a white generated media event on track two below the blood. Perform the zooming-out on the blood event and render this project to a new file. Use this file in your main project in the way described above.
Theo
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