Harmy said:

So, new issue: Has it ever been decided what's up with the scanlines being different on different releases? I'm mainly talking about Leia's hologram in SW. Now, in GOUT, there are some vague horizontal scanlines, but the are also some hardly recognisable vertical scanlines (heavy sharpening can reveal them). Now in this video from the Technidisc LD posted by msycamore, there are very clear horizontal scanlines. In the SE recomped hologram there are only vertical scanlines, so you could conclude that the horizontal scanlines were simply dropped in the SE and only the vertical ones remained, which were pretty vague before and that's why you can't really see them in those low-res LD transfers. And that's all nice and peachy, except that in MV's IB Print references, there's no trace of horizontal scanlines but there are very clear vertical scanlines. What's up with that? Could the low-res scanning process of the LDs have actually created the horizontal scanlines from the slightly tilted vertical ones?

Thinking about this again, maybe it is a possibility like you said that the scanlines we are seeing on the Leia hologram on various old video releases is just a moiré pattern of some sort: http://en.wikipedia.org/wiki/Moir%C3%A9_pattern but it doesn't look like it to me, they are so clearly defined for being just that, but it's damn weird they are only visible on some versions. Hmm... just when I thought everything was clear regarding this you had to bring this up again. ;)