diff --git a/dockers/Screenshotter/screenshotter.js b/dockers/Screenshotter/screenshotter.js
index 29cbd663a..ddb27cc70 100644
--- a/dockers/Screenshotter/screenshotter.js
+++ b/dockers/Screenshotter/screenshotter.js
@@ -3,8 +3,10 @@
 var childProcess = require("child_process");
 var fs = require("fs");
 var http = require("http");
-var path = require("path");
+var jspngopt = require("jspngopt");
 var net = require("net");
+var pako = require("pako");
+var path = require("path");
 var selenium = require("selenium-webdriver");
 
 var app = require("../../server");
@@ -271,10 +273,15 @@ function takeScreenshot(key) {
         }
         var file = path.join(dstDir, key + "-" + opts.browser + ".png");
         var deferred = new selenium.promise.Deferred();
-        fs.writeFile(file, img.buf, function(err) {
+        var opt = new jspngopt.Optimizer({
+            pako: pako
+        });
+        var buf = opt.bufferSync(img.buf);
+        fs.writeFile(file, buf, function(err) {
             if (err) {
                 deferred.reject(err);
-            } else {
+            }
+            else {
                 deferred.fulfill();
             }
         });
diff --git a/dockers/Screenshotter/screenshotter.sh b/dockers/Screenshotter/screenshotter.sh
index 93287aec7..d2cb1a5b4 100755
--- a/dockers/Screenshotter/screenshotter.sh
+++ b/dockers/Screenshotter/screenshotter.sh
@@ -8,7 +8,7 @@
 # directly.
 
 status=0
-for browserTag in firefox:2.46.0; do
+for browserTag in firefox:2.46.0 chrome:2.46.0; do
     browser=${browserTag%:*}
     image=selenium/standalone-${browserTag}
     echo "Starting container for ${image}"
diff --git a/package.json b/package.json
index 5c3468787..ae4dd4171 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,9 @@
     "jasmine-node": "2.0.0-beta4",
     "js-yaml": "^3.3.1",
     "jshint": "^2.5.6",
+    "jspngopt": "^0.1.0",
     "less": "~1.7.5",
+    "pako": "0.2.7",
     "nomnom": "^1.8.1",
     "selenium-webdriver": "^2.46.1",
     "uglify-js": "~2.4.15"
diff --git a/test/screenshotter/images/Accents-chrome.png b/test/screenshotter/images/Accents-chrome.png
index 6789a82d5..4859ab49c 100644
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index aa833407a..dda79a605 100644
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index 871065895..dea1f834f 100644
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diff --git a/test/screenshotter/images/ArrayType-firefox.png b/test/screenshotter/images/ArrayType-firefox.png
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index 9f244e0d4..73b32ea94 100644
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index 4c1869fd9..749462bc9 100644
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index f3bca59f0..0fdd4a102 100644
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