gdalio
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these gg things
here examples
https://gist.github.com/mdsumner/83816ddeceec246533e1fecf277db773
https://gist.github.com/mdsumner/15dac8f1598530e8971d430b744cb564
works fine for RGB imagery, but need to default to scaled 0,1 matrix for rasters, or allow input palette/breaks a la palr::image_pal()