// the color of a pipe boundary is (84, 56, 72)
// apparently red = 84 is unique anywhere else on canvas

for (var x = 0; x < data.width; x++) {
    var red = data.data[x * 4];
    if (red != 84) {
        continue
    }
    console.log("pipe x = ", x);
    for (var y = 0; y < data.height; y++) {
        var red2 = data.data[(x + y * data.width) * 4];
        if (red2 == 84) {
            console.log("pipe y = ", y);
            continue
        }
        break
    }
}