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I was trying to modify the overlay and add in a graphic. How do I do this?

Once a design is in Gerber format it is simply lines, arcs, circles with X,Y coordinates.  There is no longer any intelligence or associations, so editing gerbers can be a bit more tedious that in a CAD tool or Word processor.

If you wish to import a graphic file (like BMP, TIFF, etc.) into the overlay please be aware of these rules:
1.  Images with colors are not usable in Gerber - just black/white.
2.  You should have an idea what scale you want you image imported.  For example what scale should a 100x100 pixel tiff file be import as 100 mils, 100 mm, or 100 inches.

Here's a tutorial movie from the FAB 3000 user forum to import an image onto a silkscreen.
http://forums.numericalinnovations.com/post/we-need-to-place-a-logo-in-silkscreen-on-a-printed-circuit-board-can-fab-5048443?highlight=import+image

Thanks again, and please let me know if you have any other questions.

Best regards,
Simon
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