This site let me download an absolutely huge antique map of Charleston, SC. The resolution was 6,000 x 7262, which works out to forty-three megapixels.
I took the image and messed with the contrast (curves are your friend), and got a black and white image that is pretty clean.
I’m engraving a very small crop of it right now, using non pg birch and varying the power instead of convert to dots. Let’s see how this comes out.
The whole site is full of gold, but the cartouches are astounding…
Pix of the engrave shortly.