potrace DPI and SVG pattern scale interaction is annoying. Works fine at 100dpi (eg 640x480 at ~16cm wide), but with larger resolution images (more pixels, higher DPI, same output size) the SVG patterns get really tiny. So I will need to scale all the patterns to compensate.
Seems curremt GIMP can do Gaussian blur on indexed colour images. I'm sure this used to just give errors, and you'd have to convert to RGB and back manually.
current progress, 4 colour conversion in GIMP, then exported a layer for each colour, then potrace command line for each layer and assembled the output into a single SVG with a bash script.
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