today I tried to figure out how to vary the line weight based on RGB values in hopes that I could apply this to pre-drawn sketched made with a single density line.

Flash doesn't allow you to access those values directly - (probably would have been better off using another tool). I imported the Hex values from an image into a text file (using the same postscript driver trick from before) and parsed the values inside of Flash.

I used these values to control two things - the color and thickness of a line segment that swept back and forth across the page.

Again...its basically a homemade adjusting the parameters, i could get some interesting effects - but all of them looked pretty step is to try and use this logic to vary the weight of a pre-made line drawing to see if it yields more organic results than i had before...

here is the tool i used to make these.