Take the output from the keying node, and feed it into the lower image input on the mix node.Ĭlick the Alpha channel button next to the drop-down on the mix node.Īnd finally we have our key.
Take the output from the background clip, and feed it to the top image input of the mix node. To blend the two layers, you have to make a mix of the two clips so that the background shows through the now transparent bits of the foreground. You can adjust the amount of fringing and spill (reflections from the green screen on the model), but generally the keyer does a good job of guessing that for you with a decently-shot green screen.Īfter this, adding the background is more of the same with a slight twist. “Add -> Input -> Movie Clip,” navigate to your background clip and load it. Once you have pure white and pure black, reconnect the image output of the keying node to the image input on the viewer, and you’ll see you have a decent key. There are many different ways to fix this depending on the shot, but if it’s a reasonably well-shot green screen, all you will need to do is the following.Īdjust the Black Clip slider to expand the amount of greens which turn to black. Then adjust the White Clip to push the whites to prevent them from becoming transparent. (This is because the source material wasn’t perfect.) As you can see, the dark bits are supposed to be totally black, and there are still greys showing through. You can check this more accurately by dragging the string from the Matte output on the Keying node and linking to the input on the viewer. If you look carefully, you will see that there are some areas which still have a bit of colour and are not fully transparent. Click the eyedropper, and click on the image in the background somewhere on the green screen. Click the Key Colour button on the Keying node, and this displays a colour selector. You now have to select the key colour, the colour which the keyer is changing to transparent. Then drag the little dot next to Image output on the keying node, and drag it to the image input on the viewer node. Click on the little yellow dot next to Image output on the Input node, and drag it to Image input on the Keying node. Also “Add -> Output -> Viewer” to make the output from the key visible. Now select “Add -> Matte -> Keying” to add a keying node. Important: in this program flow goes from left to right, so node inputs are on the left of a node, and outputs are on the right of a node. We have to push this through a keyer to remove the green and make those areas transparent. To zoom in and out of the images you are working on, use the V and Alt-V keys.Ĭlick the Add menu in the bar at the bottom of the view and select “Input -> Movie Clip.” Select the green screen clip you added in the Movie Clip Editor. Note: to zoom in and out of the nodes, use the centre scroll wheel of the mouse if you have it. Then move the Compositing node out of the way because we won’t need it yet.
#BLENDER MOVIE EFFECTS MAC#
Select the “Render Layers” node, and because we won’t need it you can delete it (on the Mac this is the Forward Delete key).
The screen will be blank, but just go to the bottom of the view and click the middle button marked “Node Tree Type” to Display, and then check the Use Nodes and Backdrop buttons. Once the clip is loaded, go back to the drop-down and select Node Editor. (You can also load sequences of images for uncompressed keys in this step if you have the space, and the footage is the right size.) Locate the drop-down (it goes up, actually, but you know what we mean) at the bottom of the view, and select “Movie Clip Editor.”Ĭlick the “Open” button and choose and load your green screen footage. Blender is a node-based compositor which means the control mechanism is nodes or little LEGO blocks of love which you place on the screen and link with little strings which form your signal path. So we need to pull these two elements into Blender and pull a key on the green bits to make the background show through in as naturalistic a way as possible. The transparent parts will thus show the video or the image below, which will thus define the environment in which the subject of the first movie will act.
#BLENDER MOVIE EFFECTS SOFTWARE#
It’s not what the software is designed for, but it does a bangup job of green screen compositing, as you will soon see.īlender green screen uses technique of the chroma key a color is isolated (in our case the green of the green screen), or a particular luminance, it is removed and the area that was occupied by it becomes transparent, thus becoming part of the alpha channel. Unlike Lightwave, it is a modern node-based compositor like Nuke or Fusion. Just like commercial packages like Lightwave 3D, it is also a very capable compositing package. Blender is an open-source cross-platform 3D graphics program, but this doesn’t mean it’s a low-rent option.
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