diff --git a/dither4.js b/dither4.js
index ab21a23..9721a30 100644
--- a/dither4.js
+++ b/dither4.js
@@ -397,10 +397,12 @@ function decimate(input, palette, n) {
             for (let i = 0; i < palette.length; i++) {
                 let diff = rgb.difference(palette[i]);
                 let dist = diff.magnitude();
+                /*
                 let darker = Math.min(diff.r, diff.g, diff.b) < 0;
                 if (darker) {
                     dist **= 2;
                 }
+                */
                 if (dist < shortest) {
                     nextError = diff;
                     shortest = dist;
@@ -476,7 +478,7 @@ function decimate(input, palette, n) {
             // 442 is the 3d distance across the rgb cube
             //fitness[x] = 442 - (nextError.magnitude());
             //fitness[x] = 442 / (442 - nextError.magnitude());
-            fitness[x] = 255 / (256 - Math.max(nextError.r, nextError.g, nextError.b));
+            fitness[x] = 255 / (256 - Math.max(0, nextError.r, nextError.g, nextError.b));
             
             /*
             fitness[x] = Math.max(