Today this project is morphing into a generalized "make nice lo-colour/flat/line art from images" thing.

Two photos that my algorithms (currently a modified median cut that splits the largest group each time, where size is measured by the product of bounding box volume and pixel count) struggle with at the moment:

- the left image has large flat areas of almost same colour, and somehow my code dithers the top half in 3 colours instead of a nice clean split with 2 colours

- the right image has lots of greens and some "obvious" bright red, but limited to 8 colours my algorithms just give greens, no red.

GIMP does much better for both images, so next I'll look at how it does it.

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.

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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.

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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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