OK, I finally found my error: DEPTH_THRESH in find-edges has to be set
much higher for my image.

Find-Edges & the matrix are very interesting PP, very complete. A lot to
play before understanding.

Thank for Megapov0.5
DEPerere


> 
> I'm trying to get an image that lets appear only the edges of my
> objects.
> 
> But when I'm doing this:
> 
> global_settings { assumed_gamma 1
>                 post_process { overwrite_file
>                         color_matrix {< 0, 0, 0, 0, 0, 0, 0, 0, 0 >}
>                         find_edges { 1, .5, 0, 1.5, 1.0, rgb 1 }
>                 }
> }
> 
> the result is the edges, but all the black is appearing too in white and
> the shadowed surfaces are becoming clear.
> 
> What am I doing wrong?
> 
> Thanx
> DEPerere

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