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I just did it by hand using a free open source program called "GIMP" linked below.

I copied the original.

de-saturated it

pasted the original over the b&w one in a new layer

then erased everything but the vessel

https://www.gimp.org/

It is a wonderful program and I use it all the time, on Windows and Linux. Preferred over photoshop for more basic stuff.

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