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void setup() {
size(512, 256);
PImage img = loadImage("lena.png");
img.resize(256, 256);
image(img, 0, 0);
image(logarithm(img, 100), 256, 0);
}
PImage logarithm(PImage I, int k) {
PImage out = I.copy();
out.loadPixels();
float r, g, b;
float C = k/log(256);
for (int i = 0; i < out.pixels.length; ++i) {
r= C*log(1+red(out.pixels[i]));
g= C*log(1+green(out.pixels[i]));
b= C*log(1+blue(out.pixels[i]));
out.pixels[i] = color(r, g, b);
}
out.updatePixels();
return out;
}
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