Test No. 2: Movie is output at 1080i
OK, this where the fun starts--let the comparisons rip. We skip from chapter to chapter, looking for shots in which we might be able to discern differences. In scenes with close-ups of Tom Cruise--and there are a lot of them--or Philip Seymour Hoffman (the villain), it's very hard to notice a difference in detail, even when you compare the relatively low-resolution Philips 42-inch plasma (1,024x768) to the 47-inch 1080p Westinghouse (1,920x1,080), which are sitting side by side. But in chapter 5, we hit on a decent piece of test material. Tom Cruise walks into a stylish home, and there, just behind him, is a wall made of what look like small, wooden bricks. Lo and behold, if you concentrate just on that wall and scan back and forth from TV to TV, replaying the scene dozens of times, you'll notice a slight difference between the Philips and the Westinghouse; the brick pattern as displayed on the Westinghouse has a cleaner look. The difference is harder to discern when you compare the Westinghouse to the 50-inch Pioneer.
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Ultimately, we agree with the Imaging Science Foundation (ISF), a group that consults for home-theater manufacturers and trains professional video calibrators, when it says that the most important aspect of picture quality is contrast ratio, the second-most important is color saturation, and the third is color accuracy. Though resolution may be the most talked-about spec these days, it comes in fourth on the ISF list, and after you sit watching five TVs lined up side by side, you understand why. The fact is a relatively pristine high-def source such as Mission: Impossible III looks sharp on just about any HDTV, and your eye, when looking for differences, is drawn first to things like depth of detail in shadowy material (black levels) and the color of the actors' skin tone and how natural it looks.