gEDA-user: Gerbv superposition of layers

[John Griessen]

Ben Barker wrote:
  The reason I set all the corresponding
> layers to the same colours was that if I XORed two corresponding
> layers that were both the same colour, only the differences remained,

Yes, that's a tried and true checking method when making changes to large
areas of layout that small additions have been made to.  Works for chips
if you have a viewer backed by enough memory.

John Griessen

-- 
Ecosensory   Austin TX