FreeLists / si-list / [SI-LIST] Re: Comparing layers on two artworks

[Matt Wilbur <mwilbur@xxxxxxxxxxxx>]

I'm with Stuart, gerbv is the ticket, since it can used GTK_XOR.

We do this all the time in IC's, and you don't need a full-blown LVL 
tool.  You just do an XOR of layers and create an XOR DRC deck that 
flags any shapes that have changed.

Stuart Brorson wrote:
>> Thanks everyone for your suggestions!   I'm looking for an automated
>> approach to add to our verification steps.   I often envy software
>> developers who have many text file compare tools such as beyond compare.
>> Visual checking is not practical with number of signal we have.
>>     
>
> That's where the power of unix/Linux helps out.  The gerbv stuff is
> tested nightly using scripts which compare newly rendered Gerber files
> against pre-existing "golden" ones.  Differences between the
> newly rendered image and the golden one are automatically flagged
> using the script, so no human intervention is required.
> Here's the script:
>
> http://gerbv.cvs.sourceforge.net/gerbv/gerbv/test/run_tests.sh?revision=1.5&view=markup
>
> Maybe this will give you some ideas about how to use gerbv/ImageMagick
> to perform your task.
>
> Cheers,
>
> Stuart
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