Today we transitioned from working prototypes to production orders on a version 2.0 board, meaning the gerbers have to be pretty darn close to the known working prototypes, yet you need that last little tweak to fix the minor issue you found in the low quantity prototype run.
I did not want to do another prototype sized quantity run. How to reach the confidence needed to boldly move forward? One technique I worked up this afternoon involves imagemagick and gerbv and a script. http://www.imagemagick.org/script/compare.php The above tells how two PNG files can be compared using image XORing. gerbv can be scripted from the command line to output a *.PNG file for a single layer file load, both old and new images pertaining to the same layer. The attached script is just a start, but it can be used to iterate through all your gerber layers using one old gerber layer and the matching new gerber layer file as matched pairs. It worked well enough to find a bug in the silkscreen layer for me, and I am quite excited about its use moving forward, and wanted to share it with all the folks on the developer's list so that the technique can be refined and expanded upon. I hope you find the technique useful as a starting point. Dick
gerber-diff.sh
Description: Bourne shell script
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