Pixel Manipulation – Week 5

For this week assignment I was completely out of ideas. So I decided to manipulate the pixel of an image. I load the picture and then in different functions I manipulate each individual pixel of the image.

There are five different manipulations that can take place:
Inverting the RGB values of each pixel
Inverting the R values of each pixel
Inverting the G values of each pixel
Inverting the B values of each pixel
Swapping the pixels in the array
Exagerating the each RGB value with the same random number

Each of the different functions are mapped to keys 1-6 on the keyboard and pressing any other key would reload the original image.

Pressing different keys in different combinations will yield different outcomes.

Advanced Implementation

I tried to add another level of complexity to the sketch by inverting the pixels which in a circular distance of the mouse cursor.

I was able to figure the logic on paper but the logic when translated to code was not.

 

I would like to pursue this further and implement this logic

 

PImage img;
int counter = 0;
int KeyCode = -1;

void setup() {
  size(1280, 720);
  img = loadImage("scene.jpg");
  image(img, 0, 0, width, height);
  //noLoop();
}

void draw() {
  //if (mouseX>0 && mouseX<width && mouseY>0 && mouseY<height) {
  //  negativeMousePosition();
  //}
}

void keyPressed() {
  float sinVal = radians(180);
  println(sin(sinVal),cos(radians(180)));
  if (keyCode==49) { //1
    invertRGB();
    KeyCode = 49;
  } else if (keyCode==50) { //2
    invertR();
    KeyCode = 50;
  } else if (keyCode==51) { //3
    invertG();
    KeyCode = 51;
  } else if (keyCode==52) { //4
    invertB();
    KeyCode = 52;
  } else if (keyCode==53) { //5
    swapPixels();
    KeyCode = 53;
  } else if (keyCode == 54) { //6
    exagerate();
    KeyCode = 54;
  } else { //anything else
    drawOriginal();
    KeyCode = -1;
  }
}

//void mouseDragged(){
//  negativeMousePosition();
//}

void invertRGB() {
  //img = loadImage("scene.jpg");
  //image(img, 0, 0, width, height);
  loadPixels();
  for (int i=0; i<width*height; i++) {
    int r = (int)red(pixels[i]); //get red value
    int g = (int) green(pixels[i]); // get green value
    int b = (int) blue(pixels[i]); //get blue value
    color c = color(255-r, 255-g, 255-b); // take the complement of the rgb values
    pixels[i] = c; //set the new color value
  }
  updatePixels(); //update the pixels on screen
}

void invertR() {
  //img = loadImage("scene.jpg");
  //image(img, 0, 0, width, height);
  loadPixels();
  for (int i=0; i<width*height; i++) {
    int r = (int)red(pixels[i]); //get red value
    int g = (int) green(pixels[i]); // get green value
    int b = (int) blue(pixels[i]); //get blue value
    color c = color(255-r, g, b); // take the complement of the rgb values
    pixels[i] = c; //set the new color value
  }
  updatePixels(); //update the pixels on screen
}

void invertG() {
  //img = loadImage("scene.jpg");
  //image(img, 0, 0, width, height);
  loadPixels();
  for (int i=0; i<width*height; i++) {
    int r = (int)red(pixels[i]); //get red value
    int g = (int) green(pixels[i]); // get green value
    int b = (int) blue(pixels[i]); //get blue value
    color c = color(r, 255-g, b); // take the complement of the rgb values
    pixels[i] = c; //set the new color value
  }
  updatePixels(); //update the pixels on screen
}

void invertB() {
  //img = loadImage("scene.jpg");
  //image(img, 0, 0, width, height);
  loadPixels();
  for (int i=0; i<width*height; i++) {
    int r = (int)red(pixels[i]); //get red value
    int g = (int) green(pixels[i]); // get green value
    int b = (int) blue(pixels[i]); //get blue value
    color c = color(r, g, 255-b); // take the complement of the rgb values
    pixels[i] = c; //set the new color value
  }
  updatePixels(); //update the pixels on screen
}

void drawOriginal() {
  image(img, 0, 0, width, height);
}

void swapPixels() {
  //img = loadImage("scene.jpg");
  //image(img, 0, 0, width, height);
  loadPixels();
  //println(pixels[1]);
  //println(pixels[width*height-2]);

  for (int i=0; i<(width*height)/2; i++) {
    int temp;
    temp = pixels[i];
    pixels[i] = pixels[width*height-1-i];
    pixels[width*height-1-i] = temp;
  }

  updatePixels();
  //println(pixels[1]);
}

void exagerate() {
  //img = loadImage("scene.jpg");
  //image(img, 0, 0, width, height);
  loadPixels();
  for (int i=0; i<width*height; i++) {
    int r = (int)red(pixels[i]); //get red value
    int g = (int) green(pixels[i]); // get green value
    int b = (int) blue(pixels[i]); //get blue value
    int randomR = (int) random(255);
    int randomG = (int) random(255);
    int randomB = (int) random(255);
    color c = color((r+randomR), (g+randomG), (b+randomB)); // take the complement of the rgb values
    pixels[i] = c; //set the new color value
  }
  updatePixels(); //update the pixels on screen
}