diff --git a/media/articles/libraries/lock/v10/signupcustom.png b/media/articles/libraries/lock/v10/signupcustom.png
index ef9153113a..c7285ed5c4 100644
Binary files a/media/articles/libraries/lock/v10/signupcustom.png and b/media/articles/libraries/lock/v10/signupcustom.png differ
diff --git a/tools.js b/tools.js
index 277b3c3ef5..9d9412ad92 100644
--- a/tools.js
+++ b/tools.js
@@ -1,23 +1,24 @@
 var program = require('commander');
 var fs = require('fs');
+var path = require('path');
 var Imagemin = require('imagemin');
 var imageminOptipng = require('imagemin-optipng');
 
 var redirectFilePath = './redirect-urls.json';
- var addRedirect = function(oldUrl, newUrl, callback) {
-   fs.readFile(redirectFilePath, function(err, json) {
-     if (err) { return callback(err); }
+var addRedirect = function(oldUrl, newUrl, callback) {
+  fs.readFile(redirectFilePath, function(err, json) {
+    if (err) { return callback(err); }
 
-     var data = JSON.parse(json);
-     data.push({
-       from: oldUrl,
-       to: newUrl
-     });
+    var data = JSON.parse(json);
+    data.push({
+      from: oldUrl,
+      to: newUrl
+    });
 
-     json = JSON.stringify(data, null, 2);
-     fs.writeFile(redirectFilePath, json, callback);
-   });
- };
+    json = JSON.stringify(data, null, 2);
+    fs.writeFile(redirectFilePath, json, callback);
+  });
+};
 
 
 program
@@ -46,7 +47,7 @@ program.command('mv <oldUrl> <newUrl>')
   });
 
 
-program.command('img')
+program.command('imgs')
   .action(function() {
     new Imagemin()
       .src('media/**/*.png')
@@ -61,6 +62,21 @@ program.command('img')
       });
   });
 
+program.command('img <imgPath>')
+  .action(function(imgPath) {
+    new Imagemin()
+      .src(imgPath)
+      .dest(path.dirname(imgPath))
+      .use(imageminOptipng({optimizationLevel: 3}))
+      .run((err, files) => {
+        if (err) {
+          console.error(err);
+        }
+        console.log('Minified ' + files.length + ' images.');
+        //=> {path: 'build/images/foo.jpg', contents: <Buffer 89 50 4e ...>}
+      });
+  });
+