[blu-ray_girl_fan]

Real IMAX
Of the Real IMAX screens in Texas, I have seen movies in Austin's Bob Bullock Museum, Houston's Edwards Marq*E, and the San Antonio Riverwalk.

Austin Bob Bullock IMAX -- Mission Impossible Ghost Protocol (shifts from 2.39:1 to 1.44:1), The Dark Knight Rises (shifts from 2.39:1 to 1.44:1), Skyfall (constant 1.90:1 instead of 2.39:1 in regular theaters), Star Trek (35mm), Iron Man 2 (35mm)

Houston Edwards Marq*E IMAX -- Spider-man (35mm), Minority Report (35mm)

San Antonio Riverside IMAX -- True Lies (35mm), King Kong (35mm)
(I stopped going to San Antonio's Riverside IMAX b/c the King Kong showing was severely underlit. It felt like the projector was using a candle instead of a lightbulb. To be fair, I haven't had a chance to go there in several years.)

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I have seen movies in AMC, Cinemark, and Regal theaters in the Austin, Dallas, and Houston areas. Here's what I've noticed:

AMC
At NorthPark Mall in Dallas, the IMAX and ETX screens appear to be about the same size.

What I've seen:
AMC NorthPark Digital IMAX -- The Dark Knight Rises (shifts from 2.39:1 to 1.78:1)
AMC NorthPark ETX -- Flight
AMC NorthPark regular auditorium -- Skyfall (the screen was not much smaller than the Digital IMAX or ETX screens)


Cinemark
Cinemark's XD screens tend to be quite large -- certainly larger than AMC's ETX screens here in North Dallas. However, I remember when Cinemark first built Tinseltown megaplexes in Houston, and each of those megaplexes had at least two large screens. They were "XD" sized long before Cinemark created the XD brand. In essence, you got the XD experience before Cinemark started charging extra money for it.

The Cinemark IMAX in Dallas on Webb Chapel used to be a digital-only screen, but they added a film projector to show The Dark Knight Rises in 15/70 1.44:1.

What I've seen:
Cinemark Legacy XD -- The Dark Knight Rises (no aspect ratio changes), Snow White and the Huntsman, Twilight: Breaking Dawn Part 2 (Unfortunately, a lot of the movie was out of focus.)
Cinemark Webb Chapel IMAX -- The Hunger Games (digital, Lionsgate refused to make film prints for any exhibitor)
(Note: The screen is larger than what they use at AMC NorthPark, but it's still much smaller than the Real IMAX screens in Austin, Houston, and San Antonio.)


Regal
The Greenway Plaza Edwards theater is next to a large office complex, and those screens in general are smaller than the ones in the Edwards Marq*E (which is a stand-alone building located at the end of an open-air shopping center).