continous coupled cellular automaton in OpengGL/GLSL exported to full colour RGB24 PPM image, with edge detection

median cut in C exporting each of the colours to its own black on white PGM image (this one had 5 colours)

potrace from bi-level bitmap to monochrome vector SVG image, one per colour

geany text edited the 5x SVGs into one SVG document with some pattern fill defs, changed the fill of each layer to one of the patterns, added stroke.

inkscape converted to PDF

okular displayed PDF

gimp took screenshot

TODO: shell script to automate it
TODO: make more patterns to fill with

Follow

Pattern fills in PDF output by `inkscape` are broken somehow. They disappear at low zoom in Okular and are not printed.

Using `rsvg-convert` seems to work better.

```
rsvg-convert input.svg --dpi-x 72 --dpi-y 72 -f pdf > output.pdf
```

DPI setting is necessary to get correct output page size, despite the SVG being measured in pt as output by potrace.

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