diff --git a/includes/script.js b/includes/script.js
index b301238..251e429 100644
--- a/includes/script.js
+++ b/includes/script.js
@@ -43,7 +43,7 @@ $(document).ready(function() {
 
         // sum rgb differences
         return _.reduce(difference, function(sum, n) {
-          return sum + n;
+            return sum + n;
         }, 0);
     }
 
@@ -62,7 +62,7 @@ $(document).ready(function() {
     }
 
     function hexToColour(hex) {
-        var rgb = hex.match(/[\da-fA-F]{2}/g);
+        var rgb = hex.match(/[\da-f]{2}/gi);
 
         return {
             red:   parseInt(rgb[0], 16),
@@ -121,6 +121,7 @@ $(document).ready(function() {
         });
 
         // get tiles
+
         bitsyData.tiles = {};
 
         // tile 0 (background colour only) is implicit in bitsy rather than being stored in the game data
@@ -130,22 +131,21 @@ $(document).ready(function() {
             bitmap: _.chunk(_.split(_.repeat(0, 64), ''), 8)
         };
 
+        // todo: handle animated tiles properly instead of discarding the second animation frame
         var tiles = input.match(/TIL (.*)\n([01]{8}\n){8}/g);
 
-        if (tiles.length > 0) {   
-            for (var i = 0; i < tiles.length; i++) {
-                var name = tiles[i].match(/TIL .*/)[0].replace('TIL ', '');
-                
-                tiles[i] = tiles[i].replace(/TIL .*\n/, '');
+        _.each(tiles, function(tile, i) {
+            var name = tile.match(/TIL .*/)[0].replace('TIL ', '');
+            
+            tile = tile.replace(/TIL .*\n/, '');
 
-                var bitmap = tiles[i].match(/[01]/g);
+            var bitmap = tile.match(/[01]/g);
 
-                bitsyData.tiles[name] = {
-                    name: name, 
-                    bitmap: _.chunk(bitmap, 8)
-                };
-            }
-        }
+            bitsyData.tiles[name] = {
+                name: name, 
+                bitmap: _.chunk(bitmap, 8)
+            };
+        });
 
         // set palette to first imported palette and redraw
         palette = _.first(_.sortBy(bitsyData.palettes, 'id'));
@@ -197,7 +197,7 @@ $(document).ready(function() {
             var rawData    = imageData.data;
             var monochrome = [];
 
-            brightnessAdjustment = parseFloat($('#brightness').val());
+            var brightnessAdjustment = parseFloat($('#brightness').val());
 
             // for each pixel
             for (var i = 0; i < rawData.length; i += 4) {
@@ -210,10 +210,10 @@ $(document).ready(function() {
 
                 var targetColour = getClosestColour(pixel, palette);
 
-                if (targetColour.name === "background") {
-                    monochrome.push(0);
+                if (targetColour.name === "background") { // ?! why is this reversed?
+                    monochrome.push(1);
                 } else { // tile
-                    monochrome.push(1)
+                    monochrome.push(0)
                 }
 
                 rawData[i    ] = targetColour.red;
@@ -280,10 +280,10 @@ $(document).ready(function() {
 
                                 position *= 4; // 4 values (rgba) per pixel
 
-                                if (parseInt(pixel) === 1) { // ?! wtf
-                                    pixelColour = palette.background;
+                                if (parseInt(pixel) === 0) {
+                                    var pixelColour = palette.background;
                                 } else {
-                                    pixelColour = palette.tile;
+                                    var pixelColour = palette.tile;
                                 }
 
                                 rawData[position    ] = pixelColour.red;
@@ -366,4 +366,4 @@ $(document).ready(function() {
         // write
         $('textarea').val(newGameData.replace(/(ROOM .*\n(.*\n)*PAL .*)/g, '$1\n\n' + newRoom));
     });
-});
\ No newline at end of file
+});
diff --git a/readme.md b/readme.md
index ab88e8a..6edfe06 100644
--- a/readme.md
+++ b/readme.md
@@ -40,6 +40,7 @@ if (src.match(/^(file|https)?:\/\/|^\/\//)) {
 
 ## known bugs
 
+* keyup on game data input sets palette to pal 0 even if game data has not changed
 
 ## to do