On Tue, Jan 05, 2021 at 06:07:51PM +0100, Karsten Hilbert wrote: > better: fit a square around the circle ...
Thanks. gimp's ellipse drawing tool with aspect ratio locked to 1:1 pretty much does the same. The visual judgment of the circle matching (or its bounding box being a tangent, but that gives fewer check points) has a 3 to 4 pixels of variance when the experiment is repeated. It's seemingly in acceptable limits given 1 pixel is 19 micrometer. Will try to average it out. An algo would have been nicer...
