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belum sampai materinya om 🙈, baru operating dasar 🙈
for (_x, _y, pixel) in img.pixels() {
let rgb = pixel.to_rgb();
let luma = 0.2126 * rgb[0] as f64 + 0.7152 * rgb[1] as f64 + 0.0722 * rgb[2] as f64;
total_luma += luma;
luma_values.push(luma);
}
let avg_luma = total_luma / (width * height) as f64;