this is the link i got the still from via an earlier helpful link
http://passionesuper8.blogspot.com/2011/09/star-wars-episode-iva-new-hope.html
and before that also
http://originaltrilogy.com/forum/topic.cfm/Star-Wars-Colortiming-Cinematography-was-What-changes-was-done-to-STAR-WARS-in-93/post/566665/#TopicPost566665