Merge pull request #178 from marcbachmann/cleanup-examples

Cleanup of examples

.gitignore

@@ -6,3 +6,4 @@ npm-debug.log
 out*.jpg
 out*.png
 examples/*.avi
+examples/tmp/*

README.md

@@ -28,7 +28,7 @@ $ node-gyp rebuild
 ### Face Detection
 
 ```javascript
-cv.readImage("./examples/test.jpg", function(err, im){
+cv.readImage("./examples/files/mona.png", function(err, im){
   im.detectObject(cv.FACE_CASCADE, {}, function(err, faces){
     for (var i=0;i<faces.length; i++){
       var x = faces[i]
@@ -80,7 +80,7 @@ s.on('load', function(matrix){
   ...
 })
 
-fs.createReadStream('./examples/test.jpg').pipe(s);
+fs.createReadStream('./examples/files/mona.png').pipe(s);
 ```
 
 If however, you have a series of images, and you wish to stream them into a

examples/Face.js

@@ -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');
-
-	});
-
-});

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("./files/over_text.png", function(err, over_text) {
-
+    if (err) throw err;
-	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");
+    result.save("./tmp/weighted.png");
+    console.log('Image saved to ./tmp/weighted.png');
   });
-
 });
-
-

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) {
-
+    if (err) throw err;
-		//im.save('/tmp/cam.png');
+    window.show(im);
+    window.blockingWaitKey(0, 50);
   });
-
+}, 20);
-}, 1000);

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');
+  });
+});

examples/car_detection.js

@@ -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');   
-  					});
-});

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');
+});

examples/color_filter.js

@@ -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');
-
-});

examples/contours.js

@@ -9,10 +9,14 @@ 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;
+  var width = im.width();
+  var height = im.height();
+  if (width < 1 || height < 1) throw new Error('Image has no size');
 
-	var big = new cv.Matrix(im.height(), im.width()); 
+  var big = new cv.Matrix(height, width);
-	var all = new cv.Matrix(im.height(), im.width()); 
+  var all = new cv.Matrix(height, width);
 
   im.convertGrayscale();
   im_canny = im.copy();
@@ -35,7 +39,7 @@ cv.readImage('./stuff.png', function(err, im) {
 
   all.drawAllContours(contours, WHITE);
 
-
+  big.save('./tmp/big.png');
-	big.save('./big.png');
+  all.save('./tmp/all.png');
-	all.save('./all.png');
+  console.log('Image saved to ./tmp/big.png && ./tmp/all.png');
 });

examples/convert-image.js

@@ -0,0 +1,21 @@
+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();
+
+  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');
+});

examples/convert_image.js

@@ -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");
-});
-

examples/detect-shapes.js

@@ -1,9 +1,4 @@
-#!/usr/bin/env node
-
-//
 // Detects triangles and quadrilaterals
-//
-
 var cv = require('../lib/opencv');
 
 var lowThresh = 0;
@@ -17,13 +12,16 @@ 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');
 
+  var out = new cv.Matrix(height, width);
   im.convertGrayscale();
   im_canny = im.copy();
-
   im_canny.canny(lowThresh, highThresh);
   im_canny.dilate(nIters);
 
@@ -48,5 +46,6 @@ cv.readImage('./shapes.jpg', function(err, im) {
     }
   }
 
-	out.save('./out.png');
+  out.save('./tmp/detect-shapes.png');
+  console.log('Image saved to ./tmp/detect-shapes.png');
 });

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');
+  });
+
+});

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');
+  });
+});

examples/face-proxy.js

@@ -1,46 +1,30 @@
-/*
+// Face recognition proxy
-
+var http = require('http'),
-Face recognition proxy
+    request = require('request'),
-
+    cv = require('../lib/opencv');
-*/
-
-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)
- 	}
-
- 	// 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;
+    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){
-				im.faceDetect(im, {}, function(err, faces){ 	  
+      if (err) return resp.end(err.stack);
+      if (im.width() < 1 || im.height() < 1) return resp.end('Image has no size');
+
+      im.detectObject('../data/haarcascade_frontalface_alt.xml', {}, function(err, faces) {
+        if (err) return resp.end(err.stack);
+
         for (var i = 0; i < faces.length; i++){
-		            var x = faces[i]
+          var face = faces[i];
-		            im.ellipse(x.x + x.width/2, x.y + x.height/2, x.width/2, x.height/2);
+          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) 
 
+}).listen(3000, function(){ console.log('Listening on http://localhost:3000'); })

examples/face_detection.js

@@ -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');   
-  					});
-});

examples/motion-track.js

@@ -2,16 +2,18 @@ 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')
@@ -22,4 +24,3 @@ vid.read(function(err, mat){
   }
   iter();
 })
-

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;
@@ -17,8 +12,9 @@ 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) {
-cv.readImage('./quads.jpg', function(err, im) {
+  if (err) throw err;
+  if (im.width() < 1 || im.height() < 1) throw new Error('Image has no size');
 
   var out = im.copy();
 
@@ -51,5 +47,6 @@ cv.readImage('./quads.jpg', function(err, im) {
     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');
 });

examples/salt.js

@@ -1,27 +1,20 @@
 var cv = require('../lib/opencv');
 
-
+cv.readImage("./files/mona.png", function(err, im) {
-cv.readImage("./mona.png", function(err, im) {
+  salt(im, 1000);
-	salt(im, 3000);
+  im.save("./tmp/salt.png");
-	im.save("/tmp/salt.png");
+  console.log('Image saved to ./tmp/salt.png');
 });
 
-
-
 function salt(img, n) {
+  var channels;
+  if ((channels = img.channels()) != 3) return console.log('Image has only %s Channel. It\'s not possible to salt this image.', channels)
 
-
+  var width = img.width();
-	if (img.channels() == 1) {
+  var height = img.height();
-
+  for(var i = 0; i < n; i ++) {
-		console.log("1 Canales");
+    x = Math.random() * width;
-	} else if (img.channels() == 3) {
+    y = Math.random() * height;
-
+    img.set(y, x, 255);
-		for(k = 0; k < n; k ++) {
-			i = Math.random() * img.width();
-			j = Math.random() * img.height();
-
-			img.set(j, i, 255);
   }
 }
-
-}

examples/take-face-pics.js

@@ -1,19 +1,15 @@
-var cv = require('../lib/opencv')
+var cv = require('../lib/opencv');
+var vid = new cv.VideoCapture(0);
 
-var vid = new cv.VideoCapture(0)
-
-
-var snap = function(){
 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");
 
-      if (!faces){
+    var face = faces[0];
-        console.log("No Faces")
+    var ims = im.size();
-        return;
-      }
-      var face = faces[0]
-        , ims = im.size()
-      
     var im2 = im.roi(face.x, face.y, face.width, face.height)
     /*
     im.adjustROI(
@@ -22,10 +18,7 @@ var snap = function(){
        , -face.x
        , (face.x + face.width) - ims[1])
        */
-      im2.save('out.jpg')
+    im2.save('./tmp/take-face-pics.jpg')
+    console.log('Image saved to ./tmp/take-face-pics.jpg');
   })
-
-
 });
-}
-snap()

examples/warp-image.js

@@ -0,0 +1,16 @@
+var cv = require('../lib/opencv');
+
+cv.readImage("./mona.png", function(err, im) {
+  if (err) throw err;
+
+  var width = im.width();
+  var 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');
+});

examples/warp_image.js

@@ -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");
-
-});
-

smoke/smoketest.js

@@ -20,9 +20,7 @@ cv.readImage("/Users/peterbraden/Downloads/orl_faces/s6/10.pgm", function(e, im)
 
 
 */
-cv.readImage("examples/mona.png", function(e, mat){
+cv.readImage("./examples/files/mona.png", function(e, mat){
   var th = mat.threshold(200, 200, "Threshold to Zero Inverted");
-  th.save('out.png')
+  th.save('./examples/tmp/out.png')
-
 })
-

test/unit.js

@@ -43,8 +43,8 @@ vows.describe('Smoke Tests OpenCV').addBatch({
       , 'importing library multiple times is ok' : function(){
         var cv1 = require('../lib/opencv')
           , cv2 = require('../lib/opencv')
-          cv1.readImage('./examples/mona.png', function(){});
+          cv1.readImage('./examples/files/mona.png', function(){});
-          cv2.readImage('./examples/mona.png', function(){});
+          cv2.readImage('./examples/files/mona.png', function(){});
       }
     }
 
@@ -144,7 +144,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
     }
 
     , "toBuffer": function(cv){
-        var buf = fs.readFileSync('./examples/mona.png')
+        var buf = fs.readFileSync('./examples/files/mona.png')
 
         cv.readImage(buf.slice(0), function(err, mat){
           var buf0 = mat.toBuffer()
@@ -157,7 +157,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
 
     , "toBuffer Async": {
       topic: function(cv){
-          var buf = fs.readFileSync('./examples/mona.png')
+          var buf = fs.readFileSync('./examples/files/mona.png')
             , cb = this.callback
           cv.readImage(buf.slice(0), function(err, mat){
             var buff = mat.toBuffer(function(){
@@ -178,7 +178,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
         var cv = require('../lib/opencv')
           , cb = this.callback
 
-        cv.readImage("./examples/mona.png", function(err, im){
+        cv.readImage("./examples/files/mona.png", function(err, im){
           im.detectObject(cv.FACE_CASCADE, {}, cb)
         })
       }
@@ -191,8 +191,8 @@ vows.describe('Smoke Tests OpenCV').addBatch({
     }
 
     , ".absDiff and .countNonZero" : function(cv) {
-      cv.readImage("./examples/mona.png", function(err, im) {
+      cv.readImage("./examples/files/mona.png", function(err, im) {
-        cv.readImage("./examples/mona.png", function(err, im2){
+        cv.readImage("./examples/files/mona.png", function(err, im2){
           assert.ok(im);
           assert.ok(im2);
 
@@ -226,7 +226,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
     topic : require('../lib/opencv')
 
     , ".readImage from file": function(cv){
-      cv.readImage("./examples/mona.png", function(err, im){
+      cv.readImage("./examples/files/mona.png", function(err, im){
         assert.ok(im);
         assert.equal(im.width(), 500);
         assert.equal(im.height(), 756)
@@ -235,7 +235,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
     }
 
     , ".readImage from buffer" : function(cv){
-      cv.readImage(fs.readFileSync('./examples/mona.png'), function(err, im){
+      cv.readImage(fs.readFileSync('./examples/files/mona.png'), function(err, im){
         assert.ok(im);
         assert.equal(im.width(), 500);
         assert.equal(im.height(), 756)
@@ -259,7 +259,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
         var cv = require('../lib/opencv')
           , self = this
 
-        cv.readImage("./examples/mona.png", function(err, im){
+        cv.readImage("./examples/files/mona.png", function(err, im){
           cascade = new cv.CascadeClassifier("./data/haarcascade_frontalface_alt.xml");
           cascade.detectMultiScale(im, self.callback)//, 1.1, 2, [30, 30]);
         })
@@ -289,7 +289,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
           assert.equal(im.empty(), false);
           self.callback()
         }) 
-        fs.createReadStream('./examples/mona.png').pipe(s);
+        fs.createReadStream('./examples/files/mona.png').pipe(s);
       }
 
       , "loaded" : function(im){
@@ -305,7 +305,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
     , "write" : {
       topic: function(cv){
         var s = new cv.ImageStream()
-          , im = fs.readFileSync('./examples/mona.png')
+          , im = fs.readFileSync('./examples/files/mona.png')
           , self = this;
 
         s.on('data', function(m){
@@ -331,8 +331,8 @@ vows.describe('Smoke Tests OpenCV').addBatch({
         var cv = require('../lib/opencv')
           , self = this
 
-        cv.readImage('./examples/coin1.jpg', function(e, im){
+        cv.readImage('./examples/files/coin1.jpg', function(e, im){
-          cv.readImage('./examples/coin2.jpg', function(e, im2){
+          cv.readImage('./examples/files/coin2.jpg', function(e, im2){
             self.callback(im, im2, cv)
           })
         })
@@ -356,7 +356,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
       var cv = require('../lib/opencv')
         , self = this
 
-      cv.readImage('./examples/coin1.jpg', function(e, im){
+      cv.readImage('./examples/files/coin1.jpg', function(e, im){
         self.callback(null, im);
       });
     },
@@ -381,7 +381,7 @@ vows.describe('Smoke Tests OpenCV').addBatch({
         im.putText("Some text", 0, y += 20, font, [rnd(), rnd(), rnd()]);
       });
 
-      im.save("./examples/coin1-with-text.jpg");
+      im.save("./examples/tmp/coin1-with-text.jpg");
     }
   }