[weegee]

It has to do in part with the synching code that resembles the bar coding for 6. I think it is the first, middle, and end bar code sequence.

[MEGoody]

It has to do in part with the synching code that resembles the bar coding for 6.

I don't know enough about digital storage of photos to know whether it is like bar coding or not. Nevertheless, it isn't putting the mark on their forehead or hand, so it would not seem to apply.

[HundredDollars]

The left end synching code (Left Guard Bar) is 00000000000101. The center code is 01010. The Right Guard bar is 1010000000.

The UPC code for a 6 in the left half of the UPC is 0101111 and in the right half is 1010000 (the bit polarity is flipped.)

Notice the 6's on the left half (white,black,white,black,black,black,black) do not resemble the guard codes.

In your graphic the "typical six" is black,white,black,white,white,white,white. The white spaces between the black lines are just as important and canot be dropped or else it isn't a 6. Notice, the left guard is followed by 3 whites (first three digits of code 0 - left side) the center is followed by 3 blacks (first 3 digits of code 0 - right side) and the right guard is followed by a white quiet zone at least 7 wide as part of the standard.

However, the only single decimal digit that will visually resemble the 101 and 01010 guard codes (white,black,white,black,white) is a six on the right hand side. I still think it's quite a stretch to say the synching codes are sixes since they aren't even considered numbers unless they are 7 bits wide and have correct polarity.