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var img;
function preload(){
img=loadImage('noodle.jpg');
}
function setup(){
createCanvas(img.width,img.height);
image(img,0,0);
}
function draw(){
var x=random(0,img.width);
var y=random(0,img.height);
var c=img.get(x,y);
noStroke();
fill(c);
ellipse(x,y,10,10);
}