turn any grey pixels to full white

richmugget

hi, I am creating an image with fine strokes, resulting in some pixels that are various shades of grey. What I want to do is go through each pixel and if it is not fully black, make it fully white. I've been using set(xx, yy, color(255)); to successfully set pixels, but when I use the "get" command, the numbers it returns aren't sensible?

How can I determine when a pixel colour is not black please??

(p.s. I know I should be using Pixels() etc but am not that advanced yet!)

thanks in advance!

koogs

the numbers it returns aren't sensible?

https://forum.processing.org/two/discussion/8086/what-is-a-color-in-processing

jeremydouglass

Also, the reference for color:

• https://processing.org/reference/color_datatype.html

From a technical standpoint, colors are 32 bits of information ordered as AAAAAAAARRRRRRRRGGGGGGGGBBBBBBBB where the A's contain the alpha value, the R's are the red value, G's are green, and B's are blue. Each component is 8 bits (a number between 0 and 255).

richmugget

Thanks

Chrisir

i am not fully sure how to solve it

did you solve it?

maybe this:

https://processing.org/reference/brightness_.html

BGADII

Just use an if statement and re-write the color.

  for (int x = 0; x<bw.pixels.length; x++) {
        if (bw.pixels[x] >= color(25)) {
         bw.pixels[x] =  color(255);
        }
      }

Example:

PImage bw;

void setup() {

  size(100, 100);
  bw = createImage(width, height, RGB);
}

void draw() {
  background(0);

  loadPixels();
  for (int x = 0; x<width; x++) {
    for (int y =0; y<height; y++) {
      int index = x + (y*width);
      float distance = 10*width/dist(width/2, height/2, x, y);
      pixels[index] = color(distance);
    }
  }
  updatePixels();

  bw = get();
  bw.loadPixels();
  for (int x = 0; x<bw.pixels.length; x++) {
    if (bw.pixels[x] >= color(25)) {
     bw.pixels[x] =  color(255);
    }
  }

  bw.updatePixels();
  image(bw,0,0);
}

richmugget

thanks! - yes this works - seems to work when using the "Pixels" construct. I now understand that color is a 32bit RGBA value :)