Convert photo to line art?

Question

Dear Forum,
I am trialing Elements and Illustrator but cannot find a solution in help or the forums, or any book at Borders, so I hope someone can help.  I am looking for a way to convert photos (JPEGS) of flowers to black line art......like a coloring book, not just black and white or grayscale or sylhouette. I will then print out the line art (1-2 pixel black line art) to clear acetate for use as a positive original for creating a silkscreen via photo emulsion exposure (and then silkscreen printing the line art to fabric for hand painting). I am doing this by hand now.....place a sheet of acetate over the photo and outlining "edges" by eye with a fine Sharpie, then using that as the positive original. See attached file for an example. The line art needs to be relatively detailed ( e.g. petals, stamen, leaves) but not absolutely perfect as I only need to print guide lines on fabric for subsequent hand painting. It seems easy to do by "eye", tracing edges of color or tone change, but I have not figured out how to make that happen in Elements or Illustrator. Of course I have only had the trial for a couple days, and have used live trace, posterization, etc, but have not been lucky. Please point me in the right direction. If I can make this happen with an Adobe product, then I will buy it.....I have hundreds of photos to convert. Thanks.....Bob

Answer 1

If you use Threshold, you can add some gaussian blur to the image to make the edges smoother. You can also add a brightness/contrast adjustment layer between the blurred image and the threshold layer to fine tune the edges.
If you have Windows, you might want to look at Medhi's Fine Threshold filter (freeware) found here:
http://www.mehdiplugins.com/english/finethreshold.htm
Edit: You could also use Find Edges on the image first; desaturate it; then use a threshold adjustment layer. Go back to the Find Edges layer and add gaussian blur to taste. To further fine tune, slip a brightness/contrast layer between the blurred image and the threshold to control line thickness/detail. (FWIW, I would make a copy of the Find Edges layer and blur the duplicate so if you change your mind you don't have to start the project from scratch.)