From 37b06789b06ba9697447129f50b26f734a14e3d6 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@pobox.com>
Date: Fri, 24 Mar 2023 12:52:22 -0700
Subject: [PATCH] cleaner handling of reserved colors

---
 dither-image.js  | 6 +++++-
 video/combine.sh | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/dither-image.js b/dither-image.js
index 1bf07af..422686c 100644
--- a/dither-image.js
+++ b/dither-image.js
@@ -580,7 +580,11 @@ function decimate(input, palette, n) {
 
     // Median cut!
     // https://en.wikipedia.org/wiki/Median_cut
-    let buckets = [input.slice()];
+    //let buckets = [input.slice()];
+
+    // preface the reserved bits
+    let buckets = reserved.slice().map((c) => [atariRGB[c]]).concat([input.slice()]);
+
     let medianCut = (bucket, range) => {
         if (bucket.length < 2) {
             console.log(bucket);
diff --git a/video/combine.sh b/video/combine.sh
index cc81874..e56e0e5 100644
--- a/video/combine.sh
+++ b/video/combine.sh
@@ -4,6 +4,6 @@ ffmpeg \
     -i 'colamath-audio.wav' \
     -ac 2 \
     -ar 48000 \
-    -vf 'pad=w=640:h=480:x=52:y=80' \
+    -vf 'pad=w=640:h=360:x=52:y=20' \
     -pix_fmt yuv420p \
     -y colamath-dither.mp4