This week we looked at colour correcting on Nuke. We were given a script which we went through teaching us the steps to colour correcting a frame or scene. First, we looked at the Unpremult and Grade nodes. The Unpremult node takes the pixels that have ‘jagged’ sides and fills them in, adding this during a colour correct can add more of a blur or quality to something in the scene and ensures that this jagged edging is sorted. We were given a face that we used the Grade and Unpremult nodes to enhance, and place on a scene.
We then looked at white balacing. I had studied this on my Film BA on a physical camera, and on editing software during post production, so it was interesting to see how this takes shape in visual effects and compositing. We selected the white colour on the properties withing the Grade node, and placed it on the frame to apply it to the places where green was present in the white light.
We then looked at how to merge colours onto seperate frames using the Blur node, we blurred out completely the frame of a forest, and merged that within a frame of buildings to create the same array of colour onto that frame.
Work from home
I used what I had learnt from this lesson to complete the homework. We had to colour correct a plane to look more natural in the setting it was composited into. I scaled it to proportion using the Transform node. I then used the sequence we were taught, using the Grade, Premult and Unpremult, Colour Correct, Merge, Toe and Blackmatch nodes. The latter two are to correct the shadowing. I brought the green colour within the plane through and also played with exposure to ensure it looked more suited to the background.
I then focused on preparing and improving my roto on the mountain for our balloon project. I realised I needed to render more of the side of the mountain to ensure balloons passing behind it would be fully able to be seen going behind the mountain. I expanded the roto ensuring the tracker still worked alongside this.