That means they're not just relying on differences in chrominance (color), but also luminance (brightness differences) and other cool mathematical stuff that I can’t hope to understand. Ultimatte, Primatte or Keylight, are not just chroma keyers. Third, and this is the good news, the (fairly) new generation of keyers, e.g. These factors can be actors availability, construction delays, design changes, set dressing turnaround times, weather re-scheduling or delays in shooting other sets. If you do that trying to use both bluescreen and greenscreen material, you run into enormous scheduling problems, since the usage of these sets depends on a multitude of factors, which usually change during the shoot. It would have been a multiple of that, if we hadn't re-used most of the material for different sets. The cost of the amount of bluescreen we used ran into several hundred thousands of Dollars. In each of those locations, sets were constantly constructed, shot and torn down again to make room for the next set. For example, on "2012" we were shooting on 17 different stages and exterior sets in Vancouver. Second, it's a scheduling and budgeting question, even on high-budget movies. And while we're always working close with the costume, set dressing and props department to determine "illegal colors" early on, you can’t entirely exclude any hint of blue or green. Usually, we're tasked with extending live action sets or creating fully digital environments in which dozens of people, sometimes cars, plants, etc appear in front of the chroma screen. Or the Na'vi from Avatar, were they real, in front of bluescreen.īut practically, that's a lesser reason today.įirst, those clear-cut cases are rare.
Since the screen color is the color that will be removed by the compositing program, it's not a good idea to shoot, say, Kermit in front of greenscreen. The first and most obvious reason is the foreground object. Or why and how do you choose green over blue? Whenever we show footage or before-and-after shot breakdowns, there's one question that's ubiquitous: What's the difference between bluescreen and greenscreen (except for the obvious, that is). Just a few days ago we had a press conference with some 120 reporters from all over the world attending.
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