Grain

Its important to check the grains, as it will affect the final output of the image and can be picked up in QC

regions especially cleaned up elements has tell tale signs of manipulation while doing QC, so its important to take care of those specific regions and fix grain in them.

Patch Changing Lighting

Wrong method

Patching the tracked with the clone stamp approach will look fine if the image is stationary but we will face lighting problems if the object changes position.

CC By hand

This is also an improper way to work since we hand animate the CC values between frames and this consumes a lot of time on production.
Also if the light changes drastically like a red or green tint suddenly the workload increases tremendously.

Slice Tool

We can use this to monitor the color values on an selected positions of length in the screen.

Frequency seperation patching

We can seperate the image based on Hi and low Frequency which means hi freq is going to be the little details like edges and wrinkles and pores and the low frequency is going to be the general average lighting of the image.
Blur the image to get the low freq and for high freq merge in blur with “from” operation to the original plate.
So what we are doing is we paint the high frequency like clone stamp this will transfer the details to the area and we copy the same to the low freq this will transfer the light data to the high freq clone thus blending it seamlessly.

Paint work divide / multiply

Interactive Light Patch

Light / Glow matching

Sometimes an bright source can create a haze or glow on the lens, this will washout the elements around it, so when comping our elements would look out of place, to tackle this we use curve tool and analyze the light source and apply that data to a grade to change the result.

Roto and Transform

An easy way to remove trackers or cleanup a plate is using track, roto and transform. its basically clone stamp tool but its now tracked.

UV map / ST map

In Nuke, STmap stands for Spatio-Temporal Map. It is a node that allows you to warp and distort an image based on a reference image or sequence of images. This can be used for effects such as morphing between two images, creating fluid simulations, or stabilizing shaky footage. The STmap node is commonly used in visual effects and compositing to create complex image distortions and transformations.

The Expression:

Red Channel:

(x + .5) / width

Green Channel:

(y + .5) / height

Adv. mask removal | Colne and vectors

Denoise the plate using a smart vector node if you have a good GPU and write it to the disk. The output may appear as a black screen, so change the AOV to smart vector.
Adjust the vector detail based on the shot’s needs. Higher detail results in slower processing time. Lower detail can be used for shots with less detail. Write the adjusted detail to disk, as this node can slow down the script.
Pick a specific frame, roto paint the markers, blur to avoid crisp edges, and frame hold.
Use a vector distort node (in wraped src mode) to carry this information to other frames by plugging in the smart vector to the painted frame.
Use a vectorToMotion node to convert the smart vector to motion vector to apply motion blur.
Regrain from the original footage and premult to finish the process.