How to load my canvas so I can do pixel manipulation


I’d like to play around with an existing sketch which uses:

function preload() {
img = loadImage(url + str(windowWidth) + random(keywords));

Excepted that I don’t want to use an external image, I would like to work on the generated drawings from my sketch.

Here is a very simple code to illustrate what I got:

let pg;
let size = 300;

function setup() {

createCanvas(size, size);
pg = createGraphics(size,size)


function draw() {
image(pg,0,0, width, height);


function art(){

for (let i = 0; i < 100; i++) {


I would have assumed that adding everything into my pg object would be the equivalent of loadImage but apparently it’s not.

Thanks for your help

1 Like

Can you be specific about what is not working, or what you are observing when you run this code? Your code looks like it should work, but I’m not in a position to test it right now.

Hi Paul,
I’ve found a solution, I’m using get() to import my final canvas back into an object that I can pass later on into the post processing functions.
My only remaining issue is the image quality.
When I display again the content of the variable containing the result of get() I have a very poor image quality.