How to access YCbCr color attributes in Go

I'm iterating over an image's pixels trying to get the individual color values and average them out. When I do this:

bounds := img.Bounds()
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
  for x := bounds.Min.X; x < bounds.Max.X; x++ {
    fmt.Println(reflect.TypeOf(img.At(x, y)))     
  }
}

I get color.YCbCr a billion times. If I print it without reflect.TypeOf, I get a result like this:

{154 135 124}   
{153 135 124}   
{152 135 124}   
{152 135 124}   
{151 135 124}   
{149 135 124}   
{147 135 124}   

I need to be able to access the individual Y, Cb and Cr colors, but when I try img.At(x, y).Cb or img.At(x, y)['Y'] or even img.At(x, y)[0], I get various compile-time errors telling me that color.Color doesn't have those methods or doesn't support indexing.

Adding this for future reference, but to access the underling color.YCbCr you just need to type assert the value, example:

for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
	for x := bounds.Min.X; x < bounds.Max.X; x++ {
		if c, ok := img.At(x, y).(color.YCbCr); ok {
			fmt.Println(c.Y, c.Cb, c.Cr)
		} else {
			fmt.Println(reflect.TypeOf(img.At(x, y)))
		}
	}
}

It turns out the method I needed was img.At(x, y).RGBA(), this returns those values respectively.