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sampling image files / rgb / arrays / export

[6 Replies]
- 14-Mar-2011 04:12 PM
- Forum: Programming Questions
sampling image files

hi,

I think I am sort of halfway there :
reading out all the the R - G - B values for every pixel in a series of image files. See below.

I have a few questions though:

- it's incredibly slow - any way to improve performance?

- I am writing the values in a array of type "float" - how can I save this array to a text file / and ideally put a comma in between the values for separation?

- can I convert the array to a (very long) string ?

thanks a lot for any help,

Peter

-----------------------------------------------------------------------

PImage img;

void setup() {

  size(360, 240);

  //img = loadImage("test.jpg");

  // image(img,0,0);

}

void draw() {

   float[] numbers = new float[50000000];

   numbers[0]=0;



for (int i = 0; i < 1; i ++ ) {

   img = loadImage( "test" + i + ".jpg" );

   img.loadPixels();

   image(img,0,0);

  // Since we are going to access the image's pixels too

   for (int y = 0; y < height; y++) {

   for (int x = 0; x < width; x++) {

   int loc = x + y*width;

   // The functions red(), green(), and blue() pull out the 3 color components from a pixel.

   float r = red(img.pixels[loc]);

   float g = green(img.pixels[loc]);

   float b = blue(img.pixels[loc]);

   append(numbers,r);

   //append(numbers,500)

   append(numbers,g);

   append(numbers,b);

   println(r);

   println(loc);

   // Set the display pixel to the image pixel

   // pixels[loc] = color(r,g,b);

   }

   }

   //updatePixels();



   /// write values to array (csv) plus at a seperator marker at the end to distinguish files

   //saveStrings("numbers.dat", pixels);

   append(numbers,600)

}

/// send array to udp or textfile

saveBytes("numbers.dat", numbers);

//saveStrings("nouns.txt", list);

}

Libraries

[2 Replies]
- 13-Mar-2011 10:52 AM
- Forum: Contributed Library Questions
hi,

my sketch can't seem to load the required libraries when I am trying to run it - and it comes of with an error message altough I have copied the files into the folder specified under "preferences / sketchbook"

C:UAdminDocumentsProcessinglibraries

In particular I am trying to get the UDP functions to work

I have tried both the hypermedia ones and osc

can anyone help?

thanks,

Peter

UDP communincation / RGB Image Sampling

[3 Replies]
- 11-Mar-2011 01:43 AM
- Forum: Programming Questions
hi,

I am looking for the UDP communitcation library.

It's supposed to be called hypermedia.net but I can't find it anywhere!

Also, I would like to do a very simple image sampling : read out all the RGB values for every pixel of a given set of images - and send that through the UDP to Grasshopper / Rhino. In Grasshopper I can only sample a single image at a time.

can anyone point me in the right direction?

thanks,

Peter

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