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function setup() {
createCanvas(400, 400);
pixelDensity(1);
let redfield=createImage(width,height);
redfield.loadPixels();
for(let i=0;i<redfield.pixels.length;i+=4){
redfield.pixels[i]=255;
redfield.pixels[i+1]=0;
redfield.pixels[i+2]=0;
redfield.pixels[i+3]=255;
}
redfield.updatePixels();
image(redfield,0,0);
}