Week - 2 Intro to Nuke 2: Colour Theory Colour Grading and Colour Correction

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This week we take a look into Colour theory, Colour grading and Colour correction.

I downloaded the assets and the footage given to us from the shared directory, imported the still image of the of the brick wall and concrete pavement for the background and have it displayed on the footage.I then imported a jpeg image of a red postal box into the composition, On the Node graph I then tabbed and brought in transform to be able to scale the image and relocate the postal box at its now current position.

Used the reformat node to get rid of the outline of the red postal box and then using unpremult - this node divides the input’s rgb channels by its alpha. If your input images are premultiplied, this can make color corrections more accurate. Used the colour correct node then used to premult - multiplies the input’s rgb channels by its alpha. Followed by merge which is linked to the background screen and the viewer.


Screenshot of my node tree at a bigger scale,


Proceeded to add in a grade node after colour correct node, added the edge blur after premultbefore merging them to the footage.

For the next footage we tried to use shuffle node - rearrange the channels from a single image (B input) or two images (B and A inputs) and then output the result to the next node in your compositing tree. Imported a still image of the outdoor lake as background that is linked to viewer 1 on the node graph and have it displayed on the footage, I then imported a jpeg image of a crashed ship and it's reflection into the composite, as shown on the node graph.

Then merged the CG asset and its reflection using a merge node and then merged it to the footage,

Next added unpremult to the spaceship image and 4 shuffle nodes for diffuse direct, the right to that I inserted a diffuse indirect then a specular direct and then a specular indirect, Then beneath each of those nodes I inserted four merge nodes to link the assets together.

At first when I added the shuffle nodes I forgot to link the channels therefore when we merged the shuffle nodes and added the alpha channel the spacship would dissappear. I could not find what error had been done at first, Jamie then told me do it again once again the same error.

I was going through the nodes once more when I found out the channels in the shuffle node were not linked hence the spaceships dissappearence.
I inserted a grade node before the premult and on the further right hand side of the node branch with the background still image I Inserted a reformat node before the viewer.

The enlarged photo of the node viewer 

From this week I learned how to colour grade and colour correct the CG assets individual objects using shuffle node. For now I am looking at the footages given to us for our project and will decide which footage to use.
Location: Kingston upon Thames, UK

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