[SI-LIST] Re: Comparing layers on two artworks

GC Preview from Graphic Code allows you to pull in any layer from any set of
Gerbers and overlay them.  And it's free.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
503-430-1285 FAX
tom@xxxxxxxxxxxxx
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827 


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Stuart Brorson
Sent: Wednesday, April 16, 2008 2:13 PM
To: Kotson, Michael
Cc: Nima Lotfi; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Comparing layers on two artworks

> I'm looking for input on a tool for comparing artwork.   I've done a
> quick search of the archives and haven't seen anyone discuss this topic..

If you're using Linux, another option is to try this flow:

1.  Generate Gerbers using your layout tool.

2.  Read in the Gerbers using the open-source Gerber viewing tool
"gerbv", available here:

http://gerbv.sourceforge.net/

3.  Using gerbv, you can export .png files.  (Indeed, there should be
a way to just use gerbv as a command line filter to create .png files,
like this:  gerbv --export-png GerberFile.gbr

4.  Then, you can use the "compare" utility from ImageMagick to
visually compare the two .png files.  This is described here:

http://www.imagemagick.org/script/compare.php

Note that I haven't used this flow myself, so I can't warn you against
any gotchas.  However, the gerbv build system uses this flow to verify
correctness on a nightly basis (or whenever there is a checkin) so it
should work for you too.

Linux only, however!

Cheers,

Stuart
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