No.
But you can use something like bezierDetail and draw circles of various diameter along the curve to simulate various stroke width. Or make a closed shape with curves along the outer shape of the strokes, but that's more difficult...

Thanks.

I will try one of this solutions.

I try to reproduce this effect : http://uah-paris.com/wp-content/uploads/2012/01/soldes2012_4_blog-300x286.jpg

It is a linear halftone print's effect.

Thanks.

ok those are not curves but straight lines

these are white lines before a black background


idea
you could paint the lines consisting of smaller lines 90° vertical to the line you see.

Where you want the line to be thick make the small line in this place long

Where you want the line to be thin make it small

Where you want the line to be very thin make it a point

1. String TEST_FILE = "Test.jpg";
2. String URL = "https://ccrma.stanford.edu/~crg/images/open_mouth.jpg";
3. PImage img;
4.  
5. void setup()
6. {
7.   size(400, 350);
8.  
9.   img = loadImage(TEST_FILE);
10.   if (img == null) // Not downloaded yet
11.   {
12.     img = loadImage(URL);
13.     img.save(TEST_FILE); // Cache of the file
    
14.   } 
15.   image(img, 0, 0);
16. }
17.  
18. void mousePressed()
19. {
20.   float low = 255, high = 0;
21.   for (int i = 0; i < img.pixels.length; i++)
22.   {
23.     float b = brightness(img.pixels[i]);
24.     if (b < low)
25.     {
26.       low = b;
27.     }
28.     if (b > high)
29.     {
30.       high = b;
31.     }
32.   }
33.   println(low + " " + high);
34.  
35.   PGraphics halftone = createGraphics(img.width, img.height, JAVA2D);
36.   halftone.beginDraw();
37.   halftone.fill(0);
38.   halftone.noStroke();
39.   halftone.smooth();
40.   for (int i = 0; i < 2 * img.width; i += 20)
41.   {
42.     for (int x = i - img.width; x < i; x++)
43.     {
44.       int y = int(map(x, i - img.width, i, 0, img.height));
45.       if (x < 0)
46.         continue;
47.       float b = brightness(get(x, y)); // Might do an average of the region
48.       float d = map(b, low, high, 0, 10);
49.       halftone.ellipse(x, y, d, d);
50.     }
51.   }
52.   halftone.endDraw();
53.   background(255);
54.   image(halftone, 0, 0);
55. }
56.  
57. void draw() {} // Needed for mousePressed

OK ! Thanks a lot ! I was just working on it. I will try not to study your script to code it all the same in my own way.

Thanks again !

PS : I'm not sure of my english... Sorry.

Hello,

I've got a new problem : i want to save my image in jpg but i don't want to print the controls (controlP5). Is it possible ?

I think I don't use the correct way to use the controlP5 library (see my draw()).

test_lth.pde :

1. String TEST_FILE = "henri-cartier-bresson.jpg";
2. PImage img;
3. public int lineColor, backgroundColor, imageContrastMin, imageContrastMax, renduContrastMin, renduContrastMax, lineWidth, angle;
4. public boolean smoothToggle;
5. void setup() {
6.   img = loadImage(TEST_FILE);
7.   size(img.width, img.height);
8.   image(img, 0, 0);
9.   setParameters();
10.   makeControls();
11. }
12. void lhtDraw() {
13.   image(img, 0, 0);
14.   PGraphics lht = createGraphics(img.width, img.height, JAVA2D);
15.   lht.beginDraw();
16.   lht.fill(lineColorPicker.getColorValue());
17.   lht.noStroke();
18.   if (smoothToggle == true)
19.   {
20.     lht.smooth();
21.   }
22.   for (int y = 0; y < img.height; y += lineWidth) // précision du rendu
23.   {
24.     for (int x = 0; x < img.width; x++)
25.     {
26.       float b = (brightness(get(x, y)));
27.       float d = map(b, imageContrastMin, imageContrastMax, renduContrastMin, renduContrastMax); // premier couple : contraste de l'image // second couple : contraste du rendu
28.       lht.ellipse(x, y, d, d);
29.     }
30.   }
31.   lht.endDraw();
32.   background(backgroundColorPicker.getColorValue());
33.   image(lht, 0, 0);
34. }
35. void lhtPdf() {
36.   println("ddd");
37.   beginRecord(PDF, "filename.pdf");
38.   lhtDraw();
39.   endRecord();
40. }
41. void draw() {}

Controls.pde :

1. import controlP5.*;
2. public ControlP5 controlP5;
3. public controlP5.Label label;
4. public ColorPicker lineColorPicker, backgroundColorPicker;
5. void setParameters() {
6.   lineColor = color(255, 255, 255, 255);
7.   backgroundColor = color(0, 0, 0, 255);
8.   imageContrastMin = 0;
9.   imageContrastMax = 255;
10.   renduContrastMin = 0;
11.   lineWidth = 8;
12.   renduContrastMax = lineWidth / 2;
13.   angle = 0;
14.   smoothToggle = true;
15. }
16. void makeControls() {
17.   controlP5 = new ControlP5(this);
18.   int i = 10;
19.  
20.   controlP5.addTextlabel("lineColorLabel", "lineColor :", 10, i);
21.   lineColorPicker = controlP5.addColorPicker("lineColor", 10, i += 12, 255, 255);
22.   lineColorPicker.setColorValue(lineColor);
23.  
24.   controlP5.addTextlabel("backgroundColorLabel", "backgroundColor :", 10, i += 70);
25.   backgroundColorPicker = controlP5.addColorPicker("backgroundColorPicker", 10, i += 12, 255, 20);
26.   backgroundColorPicker.setColorValue(backgroundColor);
27.  
28.   controlP5.addTextlabel("contrastLabel", "contrast :", 10, i += 70);
29.   controlP5.addSlider("imageContrastMin", 0, 255, 10, i += 12, 255, 9);
30.   controlP5.addSlider("imageContrastMax", 0, 255, 10, i += 12, 255, 9);
31.   controlP5.addSlider("renduContrastMin", -50, 50, 10, i += 12, 255, 9);
32.   controlP5.addSlider("renduContrastMax", -50, 50, 10, i += 12, 255, 9);
33.  
34.   controlP5.addTextlabel("geometryLabel", "geometry :", 10, i += 20);
35.   controlP5.addSlider("lineWidth", 0, 50, 10, i += 12, 255, 9);
36.   controlP5.addSlider("angle", 0, 360, 10, i += 12, 255, 9);
37.  
38.   controlP5.addToggle("smoothToggle", true, 10, i += 20, 50, 9);
39.  
40.   controlP5.addButton("lthJpg", 1, 91, i, 50, 9);
41.  
42.   controlP5.addButton("lthPdf", 1, 153, i, 50, 9);
43.  
44.   controlP5.addButton("lhtDraw", 1, 215, i, 50, 9);
45. }

Exports :

1. import processing.pdf.*;
2. public PGraphicsPDF pdf;
3. void lthPdf() {
4.   String fileName = "test";
5.   println("lthPdf ["+fileName+".pdf] : wait");
6.   beginRecord(PDF, fileName+".pdf");
7.   lhtDraw();
8.   endRecord();
9.   println("lthPdf ["+fileName+".pdf] : ok");
10. }
11. void lthJpg() {
12.   String fileName = "test";
13.   println("lthJpg ["+fileName+".jpg] : wait");
14.  
15.   this.controlP5.hide();
16.  
17.   save(fileName+".png");
18.  
19.   //controlP5.show();
20.  
21.   println("lthJpg ["+fileName+".jpg] : ok");
22. }

Just save the lht image.