This image is hosted by NASA, but is not a NASA production. It's a "fanpic" by someone names Adam Bootle. You'll find it on the Fun Images page, under the heading "An Air Force Salute". The accompanying text reads:
the picture show apollo 15, I'm first wondering why the picture is in black and white when they got color camera's
annyway
... I can't seem to find the originals but their are crossmarks on the picture and the smaller left don't align with the big ones in the middle that are aligned with the small ones on the right, and neather is the distance to each other the same. Conclusion the left astronaut stands significantly higher and more to the left then the original. their are also some signs of photoshop near the left hand and other marks
Adam Bootle sends this picture of Dave Scott (right) and Jim Irwin (left) saluting for the camera. Scott and Irwin, part of an all-Air-Force crew, served on the Apollo 12 backup crew and, although they may not have known about the illicit self-timer, this composite would have been a natural.
Singularity is playing games.
Here's another image from the same page: