Ask user for image

Processing
1

I want to ask the user for an image and then have the sketch show the image with the window of the same size(Resizing will not work because I want to manipulate it at the pixel level). This is broken in the new processing 4.0a2 because you can no longer load image in settings so I am wondering how can I do this now? I know I am not the only person to have this problem.

2

Hi @x13420x,

I have tested this and I guess it works.
Try it out. Not sure if this is what you are looking for. Hope it helps :slight_smile:

ps: I am using processing 3.5.3

PImage img;
boolean imgSelected = false;
void setup() {
  size(100, 100);
  surface.setResizable(true);
  selectInput("Select a file to process:", "fileSelected");
}

void draw() {
  if (imgSelected) {
    image(img, 0, 0);
  }
}

void fileSelected(File selection) {
  if (selection == null) {
    println("Window was closed or the user hit cancel.");
  } else {
    println("User selected " + selection.getAbsolutePath());
    String path =  selection.getAbsolutePath();
    String breakpath[] = split(path, "\\");
    String filename = breakpath[breakpath.length - 1];
    println(filename);

    img = loadImage(filename);
    println("w = " + img.width +"\t h = " + img.height);
    surface.setSize(img.width, img.height);
    imgSelected = true;
  }
}

Best regards

1 Like
3

This code is broken in processing 4…but I did try your method and it didnt work becuase I want to manipulate the image at the pixel level. Basically I want the image to start off with the digits of pi…example first pixel RGB(contains first 3 digits of pi in base 256)…well doing your method just shows a black image…unless I start with the real size parameters…if I start off with size(100,100) then I get out of cordinates error(null pointer exception)…Yeah basically I think there is no simple way of doing this…but Ben Fry doesnt see the problem.

Thanks for trying to help…I think I need a more advanced solution

4

In my case, the code works, but since you are trying to manipulate pixels, I would suggest you look the following links.

Pixel manipulation links

https://processing.org/reference/loadPixels_.html
https://processing.org/reference/pixels.html
https://processing.org/reference/updatePixels_.html

Here you can find how to load Images, and manipulate pixels as well. I believe this should help you get on the right track at least.

Best regards

5

Yeah but if you resize the window like you showed then it breaks all the pixel manipulation…cause it is based on the original size