You are looking for edge-detect. Fliters -> Edge Detect.

Play with the algorithms to get the one you like best. Try difference
of Gaussians which might be best for what you want. After you detect
the edges, you may have to use desaturate/invert/threshold also.

HTH,
Partha


On Fri, Nov 7, 2014 at 3:34 PM, Garyfx <for...@gimpusers.com> wrote:
>>You mean just exchanging colors?
> Well, I may have not been as articulate as I could have.  I want to take JPG
> images of trailers and turn them into line schematics or outlines.  I want 
> just
> the line drawing or frame of the trailers like the images I attached in my
> original message.
>
> And... a simple grey background is sufficient.
>
> Thanks
>
> --
> Garyfx (via www.gimpusers.com/forums)
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