diff --git a/generate.sh b/generate.sh
index 3accd8b..b2626d4 100755
--- a/generate.sh
+++ b/generate.sh
@@ -1,6 +1,6 @@
 ffmpeg \
   -i llamigos-orig.webm \
-  -vf format=yuv444p,scale=80:150,setsar=1 \
+  -vf format=yuv444p,scale=80:150,pad=h=160:y=5,setsar=1 \
   -an \
   -vcodec libvpx-vp9 \
   -row-mt 1 \
diff --git a/index.html b/index.html
index c81c0e4..4b51935 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,7 @@
         <style type="text/css">
             .stretchy {
                 width:267px;
-                height: 150px;
+                height: 160px;
                 object-fit: fill;
                 image-rendering: pixelated;
             }
@@ -22,33 +22,31 @@
 
         <h2>Work canvas</h2>
         <div>
-            <canvas id="work" width="80" height="150" class="stretchy"></canvas>
+            <canvas id="work" width="80" height="160" class="stretchy"></canvas>
         </div>
 
         <script type="text/javascript">
             let width = 80;
-            let height = 150;
+            let height = 160;
+
+            let blockWidth = 2;
+            let blockHeight = 8;
+
+            let widthBlocks = width / blockWidth;
+            let heightBlocks = height / blockHeight;
 
             function fromSRGB(val) {
-                val /= 255;
                 if (val <= 0.04045) {
-                    val /= 12.92;
-                } else {
-                    val = ((val + 0.055) / 1.055) ** 2.4;
+                    return val / 12.92;
                 }
-                val *= 255;
-                return val;
+                return ((val + 0.055) / 1.055) ** 2.4;
             }
 
             function toSRGB(val) {
-                val /= 255;
                 if (val <= 0.0031308) {
-                    val *= 12.92;
-                } else {
-                    val = (val * 1.055) ** (1.0 / 2.4) - 0.055;
+                    return val * 12.92;
                 }
-                val *= 255;
-                return Math.round(val);
+                return (val * 1.055) ** (1.0 / 2.4) - 0.055;
             }
 
             function luma(r, g, b) {
@@ -57,23 +55,42 @@
 
             function update() {
                 let ctx = work.getContext('2d');
+                let pixels = new Uint8Array(width * height);
+
+                // Extract the luma
                 ctx.drawImage(source, 0, 0);
                 let bits = ctx.getImageData(0, 0, width, height);
                 let data = bits.data;
                 for (let y = 0; y < height; y++) {
                     for (let x = 0; x < width; x++) {
-                        let i = (y * width + x) * 4;
+                        let i = y * width + x;
 
-                        let r = fromSRGB(data[i]);
-                        let g = fromSRGB(data[i + 1]);
-                        let b = fromSRGB(data[i + 2]);
+                        let r = fromSRGB(data[i * 4] / 255);
+                        let g = fromSRGB(data[i * 4 + 1] / 255);
+                        let b = fromSRGB(data[i * 4 + 2] / 255);
 
-                        let gray = luma(r, g, b);
-                        let gray16 = Math.round(gray / 15) * 15;
+                        let grayLinear = luma(r, g, b);
+                        let gray = toSRGB(grayLinear);
+                        let gray16 = Math.round(gray * 15);
+                        pixels[i] = gray16;
+                    }
+                }
 
-                        data[i] = toSRGB(gray16);
-                        data[i + 1] = toSRGB(gray16);
-                        data[i + 2] = toSRGB(gray16);
+                let blocks = [];
+                for (let y = 0; y < height / blockHeight; y++) {
+                    for (let x = 0; x < width / blockWidth; x++) {
+                        let i = y * (width / blockWidth) + x;
+                    }
+                }
+
+                for (let y = 0; y < height; y++) {
+                    for (let x = 0; x < width; x++) {
+                        let i = y * width + x;
+                        let gray16 = pixels[i];
+                        let gray256 = Math.round(gray16 * 255 / 15);
+                        data[i * 4] = gray256;
+                        data[i * 4 + 1] = gray256;
+                        data[i * 4 + 2] = gray256;
                     }
                 }
                 ctx.putImageData(bits, 0, 0);