From 798a7a6193cb0dda18788034941275bb9f75ec56 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Mon, 1 Nov 2021 23:09:48 -0400
Subject: Add a README

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+k-d forests
+===========
+
+An implementation of [k-d forests](https://tavianator.com/2020/porting_kd_forests.html).
+
+This code generates images containing every possible color, in the style of [this Code Golf answer](http://codegolf.stackexchange.com/a/22326) by József Fejes.
+Colors are placed on the image one by one, next to the closest pixel already filled in.
+
+Images
+------
+
+The full 24-bit, 4096×4096 image is generated by default, which takes a while:
+
+    $ cargo run --release
+    Generating a 4096x4096 image (16777216 pixels)
+    100.00%  |  159 kpx/s  | max frontier size: 267592
+
+To try it out quickly, generate an image with reduced bit depth:
+
+    $ cargo run --release -- -b19
+    Generating a 1024x512 image (524288 pixels)
+    100.00%  |  285 kpx/s  | max frontier size: 18719
+
+There are many flags that control the order colors are placed, and how the location for each color is selected.
+Pass `--help` to see the available options.
+
+Video
+-----
+
+To make a video of the generation process, pass the `-a`/`--animate` flag, and pipe the output into `ffmpeg`.
+For example:
+
+    $ cargo run --release -- -b23 -w3840 -h2160 -a | ffmpeg -f image2pipe -r 60 -i - -c:v libx265 -x265-params lossless=1 kd-forest.mkv
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