popechild wrote:
: I believe true IMAX aspect ratio is 1.66:1 . . .
Really? It always seemed more like 1.33:1 to me.
[ pause to check
Wikipedia. ]
Aha, it seems the IMAX ratio is 1.43:1 -- so it's just a hair wider than the old-fashioned TVs but not as wide as the European (1.66:1), HDTV (1.78:1), American (1.85:1) and ultra-widescreen (anywhere from 2:1 to 2.76:1) standards.
(Note: animated films are often done in the 1.66:1 format too, though they may have been cropped to 1.85:1 for American theatres. On DVD, they sometimes keep the 1.85:1 cropping, and sometimes show the entire 1.66:1 image -- which results in slight pillarboxing. The original
Mulan DVD had 1.85:1 and 1.33:1 versions of the film, while the re-issued two-disc set had a 1.66:1 version; but I have not yet done a side-by-side comparison to confirm which version is the cropped one. Also confusing matters is the fact that, in the '60s and '70s, a number of Disney films were animated 1.33:1, on the assumption that they would go to TV, but very little happened in the tops and bottoms of the frame, so that the image could be cropped/masked in theatres. Hence, the original DVDs of
The Jungle Book,
The Aristocats and
Robin Hood were 1.33:1, but the new DVDs are all 1.66:1 or 1.78:1 -- and if you ask me, the new DVDs look rather pinched. And that's before we get to the fact that almost every company out there routinely crops All Four Sides of the image whenever they convert an animated film to DVD anyway -- which is very, very annoying, because animators tend to use the Entire Frame in a way that live-action directors don't. But I digress...)
So, when the IMAX portions are shown in 1.78:1, they are definitely losing a bit off the top and the bottom.
: Of course, almost every 1.78:1 movie does this nowadays, as "enhanced for widescreen dvds" that you see on most dvds basically means they've cut the original 1.85 to fit 1.78, otherwise you'd have little black bar slivers on almost every movie.
I've noticed that quite a few of the DVDs I have screen-capped have had black-bar slivers at the top and bottom. When I post a screen-cap on my blog, if it's 1.85:1, I post it the way I found it, whereas if it's 2.35:1 or whatever, I crop the black bars first (but if there are black slivers on the SIDES, I leave them in). For an example of this, check
this post at my blog, where I show the various actors who have played John Connor (including
Dark Knight star Christian Bale!). The first
Terminator was shot in 1.85:1, so you can see the black slivers at the top and bottom. But all the sequels have been formatted in 2.35:1 or something very similar to it, so I cropped the black bars. (I almost said the sequels were "shot" in 2.35:1, but that's not quite true; the DVD for
Terminator 2 has a featurette which shows how they shot on a bigger frame, and then cropped it one way for the "widescreen" version of the film while cropping it another way for the "fullscreen" version, or something like that. I forget what the name of that process is.)
: Oh, and from what I've read, the regular dvd just does the 2.4 without the 1.78 stuff.
If I read the back of the discs correctly, it seems that the DVD has the IMAX scenes as a stand-alone feature, so that you can watch them the way they were "meant" to be seen. But what does that mean? 1.43:1 on a 1.78:1 screen with massive pillarboxes? Slightly cropped or letterboxed to fit a 1.33:1 screen? Or have they been cropped to fit the 1.78:1 frame on the DVD, too?
: EDIT: Just for you Peter, because I know you like arcane trivia like this so much: there's a bit of a mini-uproar among a subset of CIH (constant image height) home theater aficionados over the decision by WB to do the switching aspect ratios on the bluray without providing a 2.4-only option like the regular dvd uses. Why, you ask? Because whereas most CIH theaters (like mine) use a scaler to scale the 2.4 image to the full 1.78 height, effectively cutting out the black bars in the process, some do a sort of "poor man's CIH" where they just zoom the projector image so that the black bars are projected off of the screen onto the masking.
I have to admit, I am vague on what it means to "scale" the image. If you are not zooming, then what are you doing -- stretching it?
: But anyway, all this may be outside even your bounds of curiosity...
Scaled, as it were?

No, I find this formatting stuff fascinating. Chesterton once said that art, like morality, consists of drawing the line somewhere, and I am fascinated to see how and why people draw the various lines when it comes to stuff like this.