Plate:
I wanted to try the example our teacher gave us the week before. So I started by selecting (using Ctrl+Shift) the darkest and brightest color of the plate. Then I created two different Constant nodes and merged them together in order to get a single background color. This passage was definitely pointless since the shades are not so different and quite undetectable.
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So: since the character in the foreground has a big amount of hair and the furniture is quite blurred in the background, I decided to use an IBK node. This node is one of the best Nuke’s keyers for getting details out of fine hair or blurred edges.
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To finally separate the character from the green screen, I added an IBKGizmo, to adjust red, blue, and green for despill fix.
To be fair, I played a lot with the Gizmo. I thought I would be able to match the two plates by using this node, but just later I realized that I should have used a grade node to modify the video’s color parameters in order to make it look similar to the background image.
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So that’s what I did.
After having connected the IBK Gizmo node, I decided (even if pointless) to connect the two Constant nodes to the IBK node, by using a merge in minus, to isolate the color problem.
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Finally, I added a Grade Node and modified some parameters.
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Then I added a Roto to avoid that something, apart from the character, would appear in the video.
Then I added a Blur and merged it to the plate’s alpha with operation in mask [Merge (mask)].
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Last but not least, I tracked the video. So I selected the plate, inserted a Tracker node, and put 4 track points. At first, I put those points both on the left and on the right, then I realized tho, that close to the video’s end, the character runs toward his right, and when I baked the match-move track, the background image was not matching the video’s move.
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So I did it again, but properly this time:
I tracked four points on the left, then I exported a Transform (match-move baked) node and connected it to the background image. Before this, I added a Transform node to the image.
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Final Result
As you can see tho, the match-move is still not working properly.
Basically what happened is that I forgot about setting the correct frame before tracking the points and baking the node.
Therefore, I made another track node; decided to track just the lights behind the computers on the foreground; set a frame into the Tracker dialog box “Transform”, and eventually play the tracking. Finally, you’ll create another Match-move from the tracking and connect it to the background image.
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