Hi Walter
Tried out your idea. Applied the findedges effect and the sampleimage effect to the bg layer resulting in the output colour differing from dark grey to black. Added a Adjustmentlayer with blur applied to it on top of it all (in a nested comp so as not to blur the original footage). I wasn’t quite sure how to link up the output of the sampleimage effect to the blur effect, so I made a white solid above the adjustmentlayer as a lumamatte and hooked up the layer colour to the sampleimage output.
The result is a step in the right direction: the bluring of the streaks changes as the original focus goes back and forth. But I’m finding it pretty difficult to get the correct amount of blur on the adjustmentlayer. I tried using colourcorrection effects on the white layer to make the colour differ more between white and black, but haven’t succeeded yet.
How would you link up the sampleimage output to a blur effect?
Cheers
Steve