Week - 3 2D Tracking: Tracker, Planar Tracker, Rotopaint, Match-moving

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For this week we were focusing on covering on topics such as tracker, planar tracker, rotopaint and match-moving.

In the morning session we did several colour matching exercises using a reference shot and a match shot, added a grade node and used the blackpoint, whitepoint, lift and gain to colour match one image to another (the reference). The image that has the grade node we should use Ctrl+Alt+Shift and select the blackpoint and whitepoint in the colourgrade node. Lift and gain using the other image just Ctrl+Shift. One important distinction we learnt was to also use the alt key when colour picking from the image that has the grade node attached to it, which basically tells the software to ignore the alterations made by the grade node and to colour pick from the original ungraded image. 

I then inserted another footage a diner match and a diner reference file and following a similar process I inserted a grade node beneath the match and reference files, I then linked this with files to the viewer for display.
For the next exercise we tried to grade the fotage using a reference image, followed the same approach as the last exercise.

In the afternoon session we went back to learn more about Shuffle Node,in order to breakdown a CG asset to be able to adjust the different passes individually.This led to the Premult and Unpremult nodes; just creating an alpha channel using the Shuffle node isn’t sufficient to be able to see the result in the viewer. When colour correcting and grading an image, we are altering all its channels including the alpha channel. This means we need a node that unpremultiplies as well, so we can colour correct and grade without running the risk of changing our alpha and throwing our transparency/opacity completely off.

After that we were briefly shown about LensDistortion which straightens your footage and removes the lens distortion that generally happens when recording. This is an important step when we start working in a 3D environment as there are no lens distortions in 3D space therefore if not done properly the things will not line up properly.
Location: Kingston upon Thames, UK

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