Hello, this is my first post to the mailing list, so I hopefully get everything right in explaining my particular problem:
I have a composite of a Background in which feet are moving over a pavement. As they move they make shadows on the pavement. The foreground is moving spider that was filmed on the same pavement later on. Now I want the brightness of my foreground to change exactly like the shadows of the moving feet change the brightness of the pavement in the background. Long time ago, there was a node in Shake called AnalysePixel or something like that which could read out a certain area of pixel over the whole length of a shot. With this data one could drive the ColorCorrect-node to automatically change the the brightness or any other value. I used it once to match a non-flickering shot to a flickering one (NOT FLICKER REMOVAL!!!). I found nothing similar in Nuke except the Spotmeter-function in the Viewer. But I found no hint to read its values and use it in an expression. I need something to constantly analyze the brightness over a given range of frames in a certain region of pixels and to drive a Grade or ColorCorrect-Node with this values via an expression. Does anyone have any hints on this? I'm using Nuke 6.2v1. For convenience I uploaded the comp layout: http://dl.dropbox.com/u/1891745/dpadb_022_lay_v01.mov Thanks, Paul Schoen, Vienna
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