Generative collage error

Processing Coding Questions
1

Hello, when I run this code I get this message. There are only 16 images in the sketch and they are in the data/images folder.

loading…
32images loaded!
The file data/images/._04.jpg contains bad image data, or may not be an image.
IllegalArgumentException: Width (-1) and height (-1) cannot be <= 0

int amount = int(random(1, 10));

PGraphics[] layers = new PGraphics[amount];
PGraphics[] masks = new PGraphics[amount];

import java.io.File;
String [] imageFileNames;
StringList images;

void setup() {
  size(1200, 900);

  java.io.File folder = new java.io.File(dataPath("images"));
  imageFileNames = folder.list();
  images = new StringList();

  println("loading…");
  // Load the image-files and push thems to imagess-arrayList
  for (int i = 0; i < imageFileNames.length; i++) {
    String filename = imageFileNames[I];
    if (filename.indexOf("Store") == -1) {
      images.push("data/images/"+filename);
    }
  }

  println(images.size() + "images loaded!");

  for (int i = 0; i < layers.length; i++) {
    layers[i] = createGraphics(width, height);
    masks[i] = createGraphics(width, height);
  }
}

PGraphics l, m;
PImage img;
void draw() {

  amount = int(random(3, 30));

  background(0);
  //blendMode(SCREEN);
  for (int i = 0; i < layers.length; i++) {
    l = layers[I];
    img = loadImage(images.get(int(random(images.size()))));
    img.resize(width, 0);
    l.beginDraw();
    l.clear();
    l.push();
    l.image(img, 0, 0);
    l.pop();
    l.endDraw();

    m = masks[I];
    m.beginDraw();
    m.background(#FFFFFF);
    m.noStroke();
    m.fill(0);
    m.beginShape();
    for (int j = 0; j < 12; j++) {
      float x = random(-width, width*2);
      float y = random(-height, height*2);
      m.curveVertex(x, y);
    }
    m.endShape();

    if (random(1) < 0.1) {
      m.circle(random(width), random(height), random(width/2));
    }
    m.endDraw();

    l.mask(m);
    image(l, 0, 0);
  }
  // saveFrame("out/###.png");
}
2

It looks like one of your filenames is an empty string ("") try changing this to

  for (int i = 0; i < imageFileNames.length; i++) {
    String filename = imageFileNames[i];   // You had I instead of i
    if (filename.length() > 0 && filename.indexOf("Store") == -1) {
      images.push("data/images/"+filename);
    }
  }

Obviously I can’t guarentee this works because I can’t execute the code but I hope it works :smile:

1 Like
3

There’s a much simpler way to get all file paths within a folder using listPaths():

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4

Hello, I am not sure why it said [I] because in my sketch it says small i. However, the code you provided did not work. Oh well….

5

This is the new error:

The method length() in the type String is not applicable for the arguments (int)

6

See reference:

Example:

image
image542×522 21.5 KB

:)

1 Like
7

I don’t know how to fix this.

8

So it looks like the code runs if the sketch is on the desktop of my iMac, but not when it’s on an external drive.

9

Sorry about that it was a typo :smile:: and I have corrected my post.

1 Like
10
  1. Do you get an error message?
  2. Have you checked the images file path is correct relative to your sketch code?
1 Like