Originally Posted by Dragon Mage:
1)maybe it was blue because it looked better than red.
Making it blue instead of read just because it would look "better" doesn't make much sense. Square had to have known that all summon materia was red, and making it blue for the fact that it might look nicer would cause more problems than just leaving it the way it should be. A fan of the game would be a lot more likely to ask "why is that materia blue and not red, the color it should be?" rather than "I don't like that color, even though that's what all summon materia are. I think it would look nicer if it was blue."
I meant 'better' in the sense that red didn't look as cool as the blue. The blue looked cooler and so they used the blue. I didn't mean it as a personal preference. Just that blue looked more erie/cool/magicy, whatever, blue just looked better in the way that it was being used than red. And if it looked nicer and achieved the desired affect more efficently than red, than it was used instead.
Originally Posted by Dragon Mage:
and 2)materia colors in the game got mixed up often. Why not have the same thing happen in the movie?
FF7 came out in 1997, so minor graphical flaws like that are understandable, especially since it was the first 3D FF. AC, however, was using state-of-the-art CGI technology. I doubt it would have a flaw like that considering how fantastic the rest of the movie looks.
I mentioned this as an idle afterthought. I knew that there was probably no weight to mentioning this but I threw it out there just to see what others might say. You could say that I was thinking aloud. Please don't take it seriously.
I will again mention that blue was probably used because it achieves the desired affect better than red, and was used instead of red to make the movie look as fantastic as it does now, as you yourself said.