diff --git a/examples/Face.js b/examples/Face.js
deleted file mode 100755
index 3582303..0000000
--- a/examples/Face.js
+++ /dev/null
@@ -1,20 +0,0 @@
-var cv = require('../lib/opencv');
-
-var COLOR = [0, 255, 0]; //default red
-var thickness = 2; // default 1
-
-cv.readImage('./mona.png', function(err, im) {
-
-	im.detectObject('../data/haarcascade_frontalface_alt2.xml', {}, function(err, faces) {
-
-		for(var k = 0; k < faces.length; k++) {
-
-			face = faces[k];
-			im.rectangle([face.x, face.y], [face.x + face.width, face.y + face.height], COLOR, 2);
-		}
-
-		im.save('/tmp/salida.png');
-
-	});
-
-});
diff --git a/examples/addweighted.js b/examples/addweighted.js
index 9f0743d..dc9379f 100755
--- a/examples/addweighted.js
+++ b/examples/addweighted.js
@@ -1,16 +1,14 @@
 var cv = require('../lib/opencv');
 
+cv.readImage("./files/mona.png", function(err, orig) {
+  if (err) throw err;
 
-cv.readImage("./mona.png", function(err, orig) {
-
-	cv.readImage("./over_text.png", function(err, over_text) {
-
-		var result = new cv.Matrix(orig.width(), orig.height());
-
-		result.addWeighted(orig, 0.7, over_text, 0.9);
-		result.save("/tmp/weighted.png");
-	});
+  cv.readImage("./files/over_text.png", function(err, over_text) {
+    if (err) throw err;
 
+    var result = new cv.Matrix(orig.width(), orig.height());
+    result.addWeighted(orig, 0.7, over_text, 0.9);
+    result.save("./tmp/weighted.png");
+    console.log('Image saved to ./tmp/weighted.png');
+  });
 });
-
-
diff --git a/examples/camera.js b/examples/camera.js
index 45cf27e..abe885b 100755
--- a/examples/camera.js
+++ b/examples/camera.js
@@ -1,13 +1,12 @@
 var cv = require('../lib/opencv');
 
 var camera = new cv.VideoCapture(0);
-
+var window = new cv.NamedWindow('Video', 0)
 
 setInterval(function() {
-
-	camera.read(function(err, im) {
-
-		//im.save('/tmp/cam.png');
-	});
-
-}, 1000);
+  camera.read(function(err, im) {
+    if (err) throw err;
+    window.show(im);
+    window.blockingWaitKey(0, 50);
+  });
+}, 20);
diff --git a/examples/car-detection.js b/examples/car-detection.js
new file mode 100644
index 0000000..58c2d61
--- /dev/null
+++ b/examples/car-detection.js
@@ -0,0 +1,18 @@
+var cv = require('../lib/opencv');
+
+cv.readImage("./files/car1.jpg", function(err, im){
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
+
+  im.detectObject("../data/hogcascade_cars_sideview.xml", {}, function(err, cars){
+    if (err) throw err;
+
+    for (var i=0; i < cars.length; i++){
+      var x = cars[i];
+      im.rectangle([x.x, x.y], [x.width, x.height]);
+    }
+
+    im.save('./tmp/car-detection.jpg');
+    console.log('Image saved to ./tmp/car-detection.jpg');
+  });
+});
diff --git a/examples/car_detection.js b/examples/car_detection.js
deleted file mode 100644
index ea56311..0000000
--- a/examples/car_detection.js
+++ /dev/null
@@ -1,16 +0,0 @@
-var cv = require('../lib/opencv')
-  , assert = require('assert')
-  , fs =require('fs')
-
-  cv.readImage("./car1.jpg", function(err, im){
-
-					im.detectObject("../data/hogcascade_cars_sideview.xml", {}, function(err, cars){  
- 
-								for (var i=0;i<cars.length; i++){
-									var x = cars[i];
-									im.rectangle([x.x, x.y], [x.width, x.height]);
-								}
-
-								im.save('./cars.jpg');   
-  					});
-});
\ No newline at end of file
diff --git a/examples/color-filter.js b/examples/color-filter.js
new file mode 100644
index 0000000..b7c5d6a
--- /dev/null
+++ b/examples/color-filter.js
@@ -0,0 +1,14 @@
+var cv = require('../lib/opencv');
+
+// (B)lue, (G)reen, (R)ed
+var lower_threshold = [46, 57, 83];
+var upper_threshold = [80, 96, 115];
+
+cv.readImage('./files/coin1.jpg', function(err, im) {
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
+
+  im.inRange(lower_threshold, upper_threshold);
+  im.save('./tmp/coin_detected.jpg');
+  console.log('Image saved to ./tmp/coin_detected.jpg');
+});
diff --git a/examples/color_filter.js b/examples/color_filter.js
deleted file mode 100644
index 3cea2e5..0000000
--- a/examples/color_filter.js
+++ /dev/null
@@ -1,12 +0,0 @@
-var cv = require('../lib/opencv');
-
-// (B)lue, (G)reen, (R)ed
-var lower_threshold = [46, 57, 83];
-var upper_threshold = [80, 96, 115];
-
-cv.readImage('./coin1.jpg', function(err, im) {
-
-	im.inRange(lower_threshold, upper_threshold);
-	im.save('./coin_detected.jpg');
-
-});
diff --git a/examples/contours.js b/examples/contours.js
index 6187197..0a8ac96 100755
--- a/examples/contours.js
+++ b/examples/contours.js
@@ -5,37 +5,39 @@ var highThresh = 100;
 var nIters = 2;
 var maxArea = 2500;
 
-var GREEN = [0, 255, 0]; //B, G, R
-var WHITE = [255, 255, 255]; //B, G, R
-var RED   = [0, 0, 255]; //B, G, R
+var GREEN = [0, 255, 0]; // B, G, R
+var WHITE = [255, 255, 255]; // B, G, R
+var RED   = [0, 0, 255]; // B, G, R
 
-cv.readImage('./stuff.png', function(err, im) {
+cv.readImage('./files/stuff.png', function(err, im) {
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
 
-	var big = new cv.Matrix(im.height(), im.width()); 
-	var all = new cv.Matrix(im.height(), im.width()); 
+  var big = new cv.Matrix(im.height(), im.width());
+  var all = new cv.Matrix(im.height(), im.width());
 
-	im.convertGrayscale();
-	im_canny = im.copy();
+  im.convertGrayscale();
+  im_canny = im.copy();
 
-	im_canny.canny(lowThresh, highThresh);
-	im_canny.dilate(nIters);
+  im_canny.canny(lowThresh, highThresh);
+  im_canny.dilate(nIters);
 
-	contours = im_canny.findContours();
+  contours = im_canny.findContours();
 
-	for(i = 0; i < contours.size(); i++) {
-		if(contours.area(i) > maxArea) {
-			var moments = contours.moments(i);
-			var cgx = Math.round(moments.m10/moments.m00);
-			var cgy = Math.round(moments.m01/moments.m00);
-			big.drawContour(contours, i, GREEN);
-			big.line([cgx - 5, cgy], [cgx + 5, cgy], RED);
-			big.line([cgx, cgy - 5], [cgx, cgy + 5], RED);
-		}
-	}
+  for(i = 0; i < contours.size(); i++) {
+    if(contours.area(i) > maxArea) {
+      var moments = contours.moments(i);
+      var cgx = Math.round(moments.m10 / moments.m00);
+      var cgy = Math.round(moments.m01 / moments.m00);
+      big.drawContour(contours, i, GREEN);
+      big.line([cgx - 5, cgy], [cgx + 5, cgy], RED);
+      big.line([cgx, cgy - 5], [cgx, cgy + 5], RED);
+    }
+  }
 
-	all.drawAllContours(contours, WHITE);
+  all.drawAllContours(contours, WHITE);
 
-
-	big.save('./big.png');
-	all.save('./all.png');
+  big.save('./tmp/big.png');
+  all.save('./tmp/all.png');
+  console.log('Image saved to ./tmp/big.png && ./tmp/all.png');
 });
diff --git a/examples/convert-image.js b/examples/convert-image.js
new file mode 100755
index 0000000..f7bdaeb
--- /dev/null
+++ b/examples/convert-image.js
@@ -0,0 +1,24 @@
+var cv = require('../lib/opencv');
+
+cv.readImage('./files/mona.png', function(err, im) {
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
+
+  img_hsv = im.copy();
+  img_gray = im.copy();
+
+
+  img_hsv.convertHSVscale();
+  img_gray.convertGrayscale();
+
+  console.log(img_gray.pixel(100,100));
+
+  im.save('./tmp/nor.png');
+  img_hsv.save('./tmp/hsv.png');
+  img_gray.save('./tmp/gray.png');
+
+  img_crop = im.crop(50,50,250,250);
+  img_crop.save('./tmp/crop.png');
+
+  console.log('Image saved to ./tmp/{crop|nor|hsv|gray}.png');
+});
diff --git a/examples/convert_image.js b/examples/convert_image.js
deleted file mode 100755
index db6d31a..0000000
--- a/examples/convert_image.js
+++ /dev/null
@@ -1,24 +0,0 @@
-var cv = require('../lib/opencv');
-
-
-cv.readImage("./mona.png", function(err, im) {
-
-				img_hsv = im.copy();
-				img_gray = im.copy();
-
-
-				img_hsv.convertHSVscale();
-				img_gray.convertGrayscale();
-
-				console.log(img_gray.pixel(100,100));
-
-				im.save("/tmp/nor.png");
-				img_hsv.save("/tmp/hsv.png");
-				img_gray.save("/tmp/gray.png");
-
-				img_crop = im.crop(50,50,250,250);
-				img_crop.save("crop.png");
-
-				console.log("Guardado");
-});
-
diff --git a/examples/detect-shapes.js b/examples/detect-shapes.js
index 1fa49c2..f465d23 100755
--- a/examples/detect-shapes.js
+++ b/examples/detect-shapes.js
@@ -1,9 +1,4 @@
-#!/usr/bin/env node
-
-//
 // Detects triangles and quadrilaterals
-//
-
 var cv = require('../lib/opencv');
 
 var lowThresh = 0;
@@ -11,42 +6,46 @@ var highThresh = 100;
 var nIters = 2;
 var minArea = 2000;
 
-var BLUE = [0, 255, 0]; //B, G, R
-var RED   = [0, 0, 255]; //B, G, R
-var GREEN = [0, 255, 0]; //B, G, R
-var WHITE = [255, 255, 255]; //B, G, R
+var BLUE  = [0, 255, 0]; // B, G, R
+var RED   = [0, 0, 255]; // B, G, R
+var GREEN = [0, 255, 0]; // B, G, R
+var WHITE = [255, 255, 255]; // B, G, R
 
 
-cv.readImage('./shapes.jpg', function(err, im) {
+cv.readImage('./files/shapes.jpg', function(err, im) {
+  if (err) throw err;
 
-	var out = new cv.Matrix(im.height(), im.width());
+  width = im.width()
+  height = im.height()
+  if (width < 1 || height < 1) throw new Error('Image has no size');
 
-	im.convertGrayscale();
-	im_canny = im.copy();
+  var out = new cv.Matrix(height, width);
+  im.convertGrayscale();
+  im_canny = im.copy();
+  im_canny.canny(lowThresh, highThresh);
+  im_canny.dilate(nIters);
 
-	im_canny.canny(lowThresh, highThresh);
-	im_canny.dilate(nIters);
+  contours = im_canny.findContours();
 
-	contours = im_canny.findContours();
+  for (i = 0; i < contours.size(); i++) {
 
-	for(i = 0; i < contours.size(); i++) {
+    if (contours.area(i) < minArea) continue;
 
-		if(contours.area(i) < minArea) continue;
+    var arcLength = contours.arcLength(i, true);
+    contours.approxPolyDP(i, 0.01 * arcLength, true);
 
-		var arcLength = contours.arcLength(i, true);
-		contours.approxPolyDP(i, 0.01 * arcLength, true);
+    switch(contours.cornerCount(i)) {
+      case 3:
+        out.drawContour(contours, i, GREEN);
+        break;
+      case 4:
+        out.drawContour(contours, i, RED);
+        break;
+      default:
+        out.drawContour(contours, i, WHITE);
+    }
+  }
 
-		switch(contours.cornerCount(i)) {
-		case 3:
-			out.drawContour(contours, i, GREEN);
-			break;
-		case 4:
-			out.drawContour(contours, i, RED);
-			break;
-		default:
-			out.drawContour(contours, i, WHITE);
-		}
-	}
-
-	out.save('./out.png');
+  out.save('./tmp/detect-shapes.png');
+  console.log('Image saved to ./tmp/detect-shapes.png');
 });
diff --git a/examples/face-detection-rectangle.js b/examples/face-detection-rectangle.js
new file mode 100755
index 0000000..f108eee
--- /dev/null
+++ b/examples/face-detection-rectangle.js
@@ -0,0 +1,22 @@
+var cv = require('../lib/opencv');
+
+var COLOR = [0, 255, 0]; // default red
+var thickness = 2; // default 1
+
+cv.readImage('./files/mona.png', function(err, im) {
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
+
+  im.detectObject('../data/haarcascade_frontalface_alt2.xml', {}, function(err, faces) {
+    if (err) throw err;
+
+    for (var i = 0; i < faces.length; i++) {
+      face = faces[i];
+      im.rectangle([face.x, face.y], [face.x + face.width, face.y + face.height], COLOR, 2);
+    }
+
+    im.save('./tmp/face-detection-rectangle.png');
+    console.log('Image saved to ./tmp/face-detection-rectangle.png');
+  });
+
+});
diff --git a/examples/face-detection.js b/examples/face-detection.js
new file mode 100755
index 0000000..0cc5fee
--- /dev/null
+++ b/examples/face-detection.js
@@ -0,0 +1,18 @@
+var cv = require('../lib/opencv');
+
+cv.readImage("./files/mona.png", function(err, im){
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
+
+  im.detectObject("../data/haarcascade_frontalface_alt.xml", {}, function(err, faces){
+    if (err) throw err;
+
+    for (var i = 0; i < faces.length; i++){
+      var face = faces[i];
+      im.ellipse(face.x + face.width / 2, face.y + face.height / 2, face.width / 2, face.height / 2);
+    }
+
+    im.save('./tmp/face-detection.png');
+    console.log('Image saved to ./tmp/face-detection.png');
+  });
+});
diff --git a/examples/face-proxy.js b/examples/face-proxy.js
index 93c04c1..541ba7b 100755
--- a/examples/face-proxy.js
+++ b/examples/face-proxy.js
@@ -1,46 +1,30 @@
-/*
+// Face recognition proxy
+var http = require('http'),
+    request = require('request'),
+    cv = require('../lib/opencv');
 
-Face recognition proxy
+http.createServer(function(req, resp){
+  var url = req.url.slice(1);
+  request({uri:url, encoding:'binary'}, function(err, r, body){
+    if (err) return resp.end(err.stack);
+    if (!/image\//.test(r.headers['content-type'])) return resp.end('Not an image');
 
-*/
+    cv.readImage(new Buffer(body, 'binary'), function(err, im){
+      if (err) return resp.end(err.stack);
+      if (im.width() < 1 || im.height() < 1) return resp.end('Image has no size');
 
-var http = require('http')
-  , request = require('request')
-  , cv = require('../lib/opencv')
-  , face_cascade = new cv.CascadeClassifier("./data/haarcascade_frontalface_alt.xml")
- 
- 
- 
- http.createServer(function(req, resp){
- 	var url = req.url.slice(1);
- 	console.log(url);
- 	
- 	if (url.indexOf('http') != 0){
- 		return request({uri:'http://google.com'}).pipe(resp)
- 	}
+      im.detectObject('../data/haarcascade_frontalface_alt.xml', {}, function(err, faces) {
+        if (err) return resp.end(err.stack);
 
- 	// TODO make sure image
- 	if (url.indexOf(".jpg", url.length - 4) !== -1 ||
-        url.indexOf(".png", url.length - 4) !== -1){
-        
-        request({uri:url, encoding:'binary'}, function(err, r, body){
-			if (err) throw err;
-			
-			cv.readImage(new Buffer(body, 'binary'), function(err, im){				
-				im.faceDetect(im, {}, function(err, faces){ 	  
-		          for (var i=0;i<faces.length; i++){
-		            var x = faces[i]
-		            im.ellipse(x.x + x.width/2, x.y + x.height/2, x.width/2, x.height/2);
-		          }
+        for (var i = 0; i < faces.length; i++){
+          var face = faces[i];
+          im.ellipse(face.x + face.width / 2, face.y + face.height / 2, face.width / 2, face.height / 2);
+        }
 
-		          //console.log(faces);
-				  resp.writeHead(200, {'Content-Type': 'image/jpeg'});  
-		    	  resp.end(im.toBuffer());  	                
-	        	});
-			});		
-		})
-    } else {
-    	request({uri:url || 'http://google.com'}).pipe(resp)
-    }
- }).listen(1901) 
+        resp.writeHead(200, {'Content-Type': 'image/jpeg'});
+        resp.end(im.toBuffer());
+      });
+    });
+  });
 
+}).listen(3000, function(){ console.log('Listening on http://localhost:3000'); })
diff --git a/examples/face_detection.js b/examples/face_detection.js
deleted file mode 100755
index 4538973..0000000
--- a/examples/face_detection.js
+++ /dev/null
@@ -1,18 +0,0 @@
-var cv = require('../lib/opencv')
-  , assert = require('assert')
-  , fs =require('fs')
-
-
-//console.log(cv.version)
-cv.readImage("./mona.png", function(err, im){
-
-					im.detectObject("./haarcascade_frontalface_alt.xml", {}, function(err, faces){  
- 
-								for (var i=0;i<faces.length; i++){
-									var x = faces[i];
-									im.ellipse(x.x + x.width/2, x.y + x.height/2, x.width/2, x.height/2);
-								}
-
-								im.save('./out.png');   
-  					});
-});
diff --git a/examples/motion-track.js b/examples/motion-track.js
index 08bab2e..784019d 100644
--- a/examples/motion-track.js
+++ b/examples/motion-track.js
@@ -2,19 +2,21 @@ var path = require('path'),
     cv = require('../lib/opencv');
 
 // When opening a file, the full path must be passed to opencv
-var vid = new cv.VideoCapture(path.join(__dirname, "motion.mov"));
+var vid = new cv.VideoCapture(path.join(__dirname, 'files', 'motion.mov'));
 
 vid.read(function(err, mat){
-  var track = new cv.TrackedObject(mat, [420, 110, 490, 170], {channel: "value"});
+  if (err) throw err;
+
+  var track = new cv.TrackedObject(mat, [420, 110, 490, 170], {channel: 'value'});
   var x = 0;
   var iter = function(){
     vid.read(function(err, m2){
       x++;
       var rec = track.track(m2)
-      console.log(">>", x, ":" , rec)
+      console.log('>>', x, ':' , rec)
       if (x % 10 == 0){
         m2.rectangle([rec[0], rec[1]], [rec[2], rec[3]])
- //       m2.save('./out-motiontrack-' + x + '.jpg')
+        // m2.save('./out-motiontrack-' + x + '.jpg')
       }
       if (x<100)
         iter();
@@ -22,4 +24,3 @@ vid.read(function(err, mat){
   }
   iter();
 })
-
diff --git a/examples/quad-crosses.js b/examples/quad-crosses.js
index 3632f9f..341631f 100755
--- a/examples/quad-crosses.js
+++ b/examples/quad-crosses.js
@@ -1,9 +1,4 @@
-#!/usr/bin/env node
-
-//
 // Finds quadrilaterals and fills them with an X
-//
-
 var cv = require('../lib/opencv');
 
 var lowThresh = 0;
@@ -17,39 +12,41 @@ var RED   = [0, 0, 255]; //B, G, R
 var GREEN = [0, 255, 0]; //B, G, R
 var WHITE = [255, 255, 255]; //B, G, R
 
+cv.readImage('./files/quads.jpg', function(err, im) {
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
 
-cv.readImage('./quads.jpg', function(err, im) {
+  var out = im.copy();
 
-	var out = im.copy();
+  im.convertGrayscale();
+  im_canny = im.copy();
 
-	im.convertGrayscale();
-	im_canny = im.copy();
+  im_canny.canny(lowThresh, highThresh);
+  im_canny.dilate(nIters);
 
-	im_canny.canny(lowThresh, highThresh);
-	im_canny.dilate(nIters);
+  contours = im_canny.findContours();
 
-	contours = im_canny.findContours();
+  for (i = 0; i < contours.size(); i++) {
 
-	for(i = 0; i < contours.size(); i++) {
+    var area = contours.area(i);
+    if (area < minArea || area > maxArea) continue;
 
-		var area = contours.area(i);
-		if(area < minArea || area > maxArea) continue;
+    var arcLength = contours.arcLength(i, true);
+    contours.approxPolyDP(i, 0.01 * arcLength, true);
 
-		var arcLength = contours.arcLength(i, true);
-		contours.approxPolyDP(i, 0.01 * arcLength, true);
+    if (contours.cornerCount(i) != 4) continue;
 
-		if(contours.cornerCount(i) != 4) continue;
+    var points = [
+      contours.point(i, 0),
+      contours.point(i, 1),
+      contours.point(i, 2),
+      contours.point(i, 3)
+    ]
 
-		var points = [
-			contours.point(i, 0),
-			contours.point(i, 1),
-			contours.point(i, 2),
-			contours.point(i, 3)
-		]
+    out.line([points[0].x,points[0].y], [points[2].x, points[2].y], RED);
+    out.line([points[1].x,points[1].y], [points[3].x, points[3].y], RED);
+  }
 
-		out.line([points[0].x,points[0].y], [points[2].x, points[2].y], RED);
-		out.line([points[1].x,points[1].y], [points[3].x, points[3].y], RED);
-	}
-
-	out.save('./out.png');
+  out.save('./tmp/quad-crosses.png');
+  console.log('Image saved to ./tmp/quad-crosses.png');
 });
diff --git a/examples/salt.js b/examples/salt.js
index 9c22b6e..49f19b5 100755
--- a/examples/salt.js
+++ b/examples/salt.js
@@ -1,27 +1,17 @@
 var cv = require('../lib/opencv');
 
-
-cv.readImage("./mona.png", function(err, im) {
-	salt(im, 3000);
-	im.save("/tmp/salt.png");
+cv.readImage("./files/mona.png", function(err, im) {
+  salt(im, 3000);
+  im.save("./tmp/salt.png");
+  console.log('Image saved to ./tmp/salt.png');
 });
 
-
-
 function salt(img, n) {
+  if ((var channels img.channels()) != 3) return console.log('Image has only %s Channel. It\'s not possible to salt this image.', channels)
 
-
-	if (img.channels() == 1) {
-
-		console.log("1 Canales");
-	} else if (img.channels() == 3) {
-
-		for(k = 0; k < n; k ++) {
-			i = Math.random() * img.width();
-			j = Math.random() * img.height();
-
-			img.set(j, i, 255);
-		}
-	}
-
+  for(var i = 0; i < n; i ++) {
+    x = Math.random() * img.width();
+    y = Math.random() * img.height();
+    img.set(y, x, 255);
+  }
 }
diff --git a/examples/take-face-pics.js b/examples/take-face-pics.js
index 7f6efa2..418809b 100644
--- a/examples/take-face-pics.js
+++ b/examples/take-face-pics.js
@@ -1,31 +1,24 @@
-var cv = require('../lib/opencv')
+var cv = require('../lib/opencv');
+var vid = new cv.VideoCapture(0);
 
-var vid = new cv.VideoCapture(0)
+vid.read(function(err, im){
+  if (err) throw err;
 
+  im.detectObject(cv.FACE_CASCADE, {}, function(err, faces){
+    if (err) throw err;
+    if (!faces.length) return console.log("No Faces");
 
-var snap = function(){
-  vid.read(function(err, im){
-    im.detectObject(cv.FACE_CASCADE, {}, function(err, faces){
-
-      if (!faces){
-        console.log("No Faces")
-        return;
-      }
-      var face = faces[0]
-        , ims = im.size()
-      
-      var im2 = im.roi(face.x, face.y, face.width, face.height)
-      /*
-      im.adjustROI(
-           -face.y
-         , (face.y + face.height) - ims[0]
-         , -face.x
-         , (face.x + face.width) - ims[1])
-         */
-      im2.save('out.jpg')
-    })
-
-
-  });
-}
-snap()
+    var face = faces[0];
+    var ims = im.size();
+    var im2 = im.roi(face.x, face.y, face.width, face.height)
+    /*
+    im.adjustROI(
+         -face.y
+       , (face.y + face.height) - ims[0]
+       , -face.x
+       , (face.x + face.width) - ims[1])
+       */
+    im2.save('./tmp/take-face-pics.jpg')
+    console.log('Image saved to ./tmp/take-face-pics.jpg');
+  })
+});
diff --git a/examples/warp-image.js b/examples/warp-image.js
new file mode 100644
index 0000000..9f4dda2
--- /dev/null
+++ b/examples/warp-image.js
@@ -0,0 +1,16 @@
+var cv = require('../lib/opencv');
+
+cv.readImage("./mona.png", function(err, im) {
+  if (err) throw err;
+
+  width = im.width();
+  height = im.height();
+  if (width < 1 || height < 1) throw new Error('Image has no size');
+
+  var srcArray = [0, 0, width, 0, width, height, 0, height];
+  var dstArray = [0, 0, width * 0.9, height * 0.1, width, height, width * 0.2, height * 0.8];
+  var xfrmMat = im.getPerspectiveTransform(srcArray, dstArray);
+  im.warpPerspective(xfrmMat, width, height, [255, 255, 255]);
+  im.save("./warp-image.png");
+  console.log('Image saved to ./tmp/warp-image.png');
+});
diff --git a/examples/warp_image.js b/examples/warp_image.js
deleted file mode 100644
index 9b11178..0000000
--- a/examples/warp_image.js
+++ /dev/null
@@ -1,23 +0,0 @@
-var cv = require('../lib/opencv');
-
-cv.readImage("./mona.png", function(err, im) {
-
-  var srcArray = [
-    0,0,
-    im.width(),0,
-    im.width(),im.height(),
-    0,im.height()];
-  var dstArray = [
-    0,0,
-    im.width()*.9,im.height()*.1,
-    im.width(),im.height(),
-    im.width()*.2,im.height()*.8];
-
-  var xfrmMat = im.getPerspectiveTransform(srcArray,dstArray);
-  img_warp = im.copy();
-  img_warp.warpPerspective(xfrmMat,im.width,im.height,[255,255,255]);
-
-  img_warp.save("/tmp/mona_warp.png");
-
-});
-