c = img.getPixel(); r = c[0]-c[1]-c[2]; if(r>10){img.setPixel([45,40,50])}
c = img.getPixel(); r = c[0]-c[1]-c[2]; if(r>10){img.setPixel([60,169,113])}
c = img.getPixel(); r = c[0]-c[1]-c[2]; if(r>30){img.setPixel(c[0]-30,c[1]+30,c[2]+30)}
oppure
c = img.getPixel(); r = c[0]-c[1]-c[2]; if(r>30){img.setPixel(c[0]-30,c[0]-c[1],c[0]-c[2])}