Self Titled Album Cover

I've always wondered this. Is the band in the middle of the picture supposed to be blended in with the background and it's just terrible photoshop since it was the 1970s, or is it supposed to be like that? Someone answer please the curiosity is killing me!

I've always wondered this. Is the band in the middle of the picture supposed to be blended in with the background and it's just terrible photoshop since it was the 1970s, or is it supposed to be like that? Someone answer please the curiosity is killing me!