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Tracking the Brightest and Darkest Pixels

You can track the brightest and the darkest pixels in your frame sequence:

1.   Select Image > CurveTool to add a CurveTool node after the image sequence you want to analyze.
2.   Connect a Viewer to the CurveTool.
3.   From the Curve Type dropdown menu, select Max Luma Pixel.
4.   Click Go! to analyze the frame sequence. This opens the Frames to Execute dialog.
5.   Define the frame range you want to analyze. Enter the first frame, followed by a comma and the last frame. Then, click OK. Nuke analyzes the frame sequence, tracking both the position and the values of the brightest and darkest pixels.
6.   You can find the results of the analysis on the MaxLumaData tab. You’ll notice that the input fields have turned blue to indicate that they are animated over time. To see the animation curve, right-click on an input field and select Curve editor.

Once Nuke has created the animation curve, you can copy the animation or any of its values into another node to match that node’s effect with the brightest or darkest pixels in the frame sequence. Ctrl/Cmd+click on the animation button and drag and drop it to another parameter to create an expression linking the two.