PImage img = loadImage("lena2.bmp");
int w = img.width;
int h = img.height;
size(2*w,h);
image(img, 0, 0);
img.loadPixels();
PImage edgeImg = createImage(img.width, img.height, RGB);
for (int y = 1; y < img.height-1; y++) {
for (int x = 1; x < img.width-1; x++) {
float sum = 0;
int pos = x + y*img.height;
int pos_sasiad = (x+1) + y*img.height;
float val = red(img.pixels[pos]);
float val_sasiad = red(img.pixels[pos_sasiad]);
float r = red(img.pixels[pos]);
float g = green(img.pixels[pos]);
float b = blue(img.pixels[pos]);
float r_sasiad = red(img.pixels[pos_sasiad]);
float g_sasiad = green(img.pixels[pos_sasiad]);
float b_sasiad = blue(img.pixels[pos_sasiad]);
if (val == 0) {
r = r_sasiad;
g = g_sasiad;
b = b_sasiad;
}
else if (val == 255) {
r = r_sasiad;
g = g_sasiad;
b = b_sasiad;
}
edgeImg.pixels[y*img.width + x] = color(r,g,b);
}
}
edgeImg.updatePixels();
image(edgeImg, w, 0);
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