Go image pkg overhead vs array

gistfile1.txt

package main

import (
	"fmt"
	"image"
	"image/color"
	"time"
)

func main() {
	// pixels := [1920 * 1080]uint8{}

	img := image.NewRGBA(image.Rectangle{Max: image.Point{
		X: 1920,
		Y: 1080,
	}})

	before := time.Now()
	for z := 0; z < 60; z++ {
		for x := 0; x < 1920; x++ {
			for y := 0; y < 1080; y++ {
				// pixels[y * 1920 + x] = 1
				img.Set(x, y, color.RGBA{
					R: 255,
					G: 255,
					B: 255,
					A: 255,
				})
			}
		}
	}

	fmt.Println("Time: ", time.Since(before))
}