diff --git a/includes/script.js b/includes/script.js
index 7669558..ffc7c54 100644
--- a/includes/script.js
+++ b/includes/script.js
@@ -203,9 +203,9 @@ $(document).ready(function() {
             for (var i = 0; i < rawData.length; i += 4) {
                 // this brightness adjustment is pretty crude but whatever
                 var pixel = {
-                    red:   Math.min(rawData[i    ] + brightnessAdjustment, 255),
-                    green: Math.min(rawData[i + 1] + brightnessAdjustment, 255),
-                    blue:  Math.min(rawData[i + 2] + brightnessAdjustment, 255),
+                    red:   _.clamp(rawData[i    ] + brightnessAdjustment, 0, 255),
+                    green: _.clamp(rawData[i + 1] + brightnessAdjustment, 0, 255),
+                    blue:  _.clamp(rawData[i + 2] + brightnessAdjustment, 0, 255),
                 };
 
                 var targetColour = getClosestColour(pixel, palette);