ORIGINAL: Ike99
rtrapasso-Note the line between the actor's helmet and the dark explosion in the background. This shouldn't be present if they were shot together.
Ahhh...
Take any black and white Japanese camera from the period and where black or a shadow meets a bright or lighter area it produces a line. You can zoom up any one of these pictures and find projection screen lines all over the place, look.
Sorry - they do not look the same to me at all. The lines show differing thickness in the "grenade" photo.
Also, do not confuse these with "Mach" lines - lines you eye will "create" in seeing different densities next to each other... they are a form of optical illusion:
"Mach bands are optical illusions produced by an extensive lateral inhibition network within the retina. They are seen on every radiograph. Both positive and negative Mach bands can be seen at a boundary, but only one type is usually seen at boundaries created by biological structures because of their shape."
http://www.blackwell-synergy.com/doi/ab ... alCode=vru
These show up in looking at x-rays where i first encountered the phenomenom - but they also show up in looking at almost anything when you carefully examine stuff (esp B&W photos).
When you encounter them, you will swear there is a line present - but if you scan with a densitometer, there is no line actually present. They are usually very thin and pretty homogenous, not varying greatly in thickness.
EDIT: Notice the lines you have pointed out are between light and dark objects. The lines on the "grenade" photo are seen consistently (not just in one area) between two dark objects (the helmet and the explosion so indicate light being projected onto the foreground object.
If the light colored line was just on one side (instead of all around) you could possibly argue it was reflection from a light source from that side, but not if a light line it is on two separate sides.
Notice there is light on 3 sides of the fist from the photo from the "grenade" photo.
