RB remap

sketch.pde

PImage img;
img = loadImage("https://espnfivethirtyeight.files.wordpress.com/2017/03/wasserman-landslides1.png", "png");
img.loadPixels();
int w = img.width;
int h = img.height;
int len = w * h;
for(int i=0; i<len; ++i) {
    color c = img.pixels[i];
    float r = red(c);
    float b = blue(c);
    println(r);
    float normalize = 1.0 / sqrt(r*r + b*b);
    r *= normalize;
    b *= normalize;
    img.pixels[i] = color(255 * r, 0, 255 * b);
}
img.updatePixels();
img.save("remapped.png");