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Convert an Icons's Theme

We will take advantage of gowall's support for stdin and stdout,familiarize yourself with how gowall does that before attempting this, check it out here

icons image example

SVG Icons​

Gowall and Inkscape SVG​

Here is a 1-liner of how to use gowall to recolor the icons and inkscape to transform raster data to vector data.
Tweak the --colors flag in inkscape for more detail.

rsvg-convert -b none -f png input.svg | gowall convert - - -t <theme> | inkscape --pipe --trace-bitmap --colors 10 --export-plain-svg=out.svg

So why use inkscape? Well having tried out potrace which only works for black/white images, vtracer which was disappointing in the result, i'm not really left with many options.

Hacky trick fake SVG​

This is a trick that's used by a lot of these "png to svg" converters you see online. You just embed data as base64 inside the SVG.It's appearance looks like an svg, but it lost the scalability svg's have. So i call that a fake SVG.

The only way to really transform raster data to vector data is to trace it with a vector graphics editor (inkscape,krita). Change the width and height accordingly if the svg is pixelated.

 rsvg-convert -b none -f png ~/Pictures/svg/firefox.svg \
  | gowall convert - - -t <theme> \
  | base64 -w 0 \
  | awk 'BEGIN {
           print "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">"
           print "  <image xlink:href=\"data:image/png;base64," 
         }
         { printf "%s", $0 }
         END { print "\" width=\"64px\" height=\"64px\"/></svg>" }' > ~/Pictures/svg/output.svg

Use a small 1b paramaters model​

Setup the starvector model. Then you can pass it gowall's image data and let it do the svg tracing. The results are pretty decent as well.

ICO Icons​

You can use anything to feed to transform that .ico into one of the common image formats then just feed it into gowall. If using imagemagick then tweak the -resize flag to your liking.

magick convert c.ico png:- | gowall convert - - -t catppuccin | magick convert - -resize 128x128 ~/Pictures/final.ico