Question: How big was the projection at Stone Mountain in 2011 compared to IMAX?
About the article "Stone Mountain", section "Attractions".

Candidate passages:
London has another traditional IMAX cinema at the Science Museum in South Kensington/Albertopolis and in December 2008 gained IMAX digital cinemas at Odeon cinemas in Greenwich and Wimbledon.
In 2011, a digital IMAX screen was also opened at the Odeon in Swiss Cottage.
Digital IMAX screens are inferior to traditional film IMAX screens, being much smaller and not offering the same image resolution as 70mm film. 
DMAX is a motion picture large screen film format developed by the China Research Institute of Film Science & Technology and the China Film Group Corporation.
It has been described as a competitor to IMAX and as laying the foundation for Chinese film projection technology using indigenous Chinese technology and intellectual property.
DMAX was put into commercial use in 2012.
Standard screen size is 20x12 meters which can be compared with IMAX screens which are at least 22x16 meters.
According to Yang Xuepei, head of the Institute, 2D and 3D quality is as good as foreign brands.
DMAX will have as many foreign moves as IMAX as well as indigenous Chinese movies.
Price will be considerably less expensive than IMAX due to lower patent fees.
At least 15 DMAX screens are planned to open this year in China.
IMAX currently has nearly 60 screens in China. 
IMAX is a system using film with more than ten times the frame size of a 35 mm film to produce image quality far superior to conventional film.
IMAX theaters use an oversized screen as well as special projectors.
Invented by a Canadian company, the first permanent IMAX theater was at Ontario Place in Toronto, Ontario, Canada.
At the IMAX cinema attached to the National Media Museum in Bradford, West Yorkshire, England, in the United Kingdom, visitors to the museum's sixth floor can observe the IMAX projection booth via a glass rear wall, and watch the large format films being loaded and projected. 
The IMAX Corporation is a Canadian theatre company which designs and manufactures IMAX cameras and projection systems as well as performing film development, production, post production and distribution to IMAX affiliated theatres worldwide.
It was founded in 1968 as a result of Expo 67 in Montreal.
It has operations in Toronto, as well as New York City and Los Angeles.
As of December 2012, the IMAX theater network consisted of more than 731 theatres (IMAX, IMAX 3D and IMAX Dome) in more than 53 countries.
The majority of theatres are equipped with IMAX 3D. 
Because 70mm film and projectors are costly and difficult to mass produce, IMAX debuted a digital projection system in 2008.
It uses two projectors that can present either 2D or 3D content in DCI or IMAX Digital Format (IDF) (which in itself is a superset of DCI).
, IDF uses 2K-resolution Christie projectors with Texas Instruments' Digital Light Processing (DLP) technology alongside parts of IMAX's proprietary formats.
The two 2K images are projected over each other to make the image brighter.
The digital installations have caused some controversy, as many theaters have branded their screens as IMAX after merely retrofitting standard auditoriums with IMAX digital projectors.
The screen sizes in these auditoriums are much smaller than those in the purpose-built auditoriums of the original 15/70 IMAX format.
These theaters charge the same premium pricing as the purpose-built IMAX theaters, resulting in consumer confusion.
Another disadvantage is the much lower resolution of digital IMAX compared to traditional IMAX film, which is estimated to be up to 8,700 lines of vertical resolution on the camera negative and 4,500 on a release print.
Some reviewers also note that many non-IMAX theaters are already projecting films at 4K resolution, while digital IMAX has deployed both 2K and 4K products.
Despite these concerns, IMAX has consistently chosen to hold to a uniform marketing position of "The IMAX Experience" regardless of the various underlying technologies and screen sizes.
Some high profile figures such as film critic Roger Ebert and others also actively voiced their concerns.
On Feb 3, 2012, IMAX announced that it had selected Barco as the primary supplier of projectors for the next 7 years.
In late April 2012, IMAX began testing a new 4K laser-projection system, based on patents licensed from Eastman Kodak.
Like the film and digital systems, it uses two projectors but it has been said to improve over the smaller digital screens by retaining the traditional IMAX aspect ratio and to allow films to be shown on screens 36 m feet wide or more.
The laser projector will be available to exhibitors in the fourth quarter of 2013.IMAX has been moving forward with digital projection with success with "The Hunger Games" and "The Avengers" and the format has also aided in the company's worldwide growth, especially in Russia and China.
Mainly because the system facilitates inexpensive distribution of IMAX features, the company has recently announced that they are re-renovating specially selected locations around the world to present both 70mm analog as well as digital presentations.
To do so, IMAX has, with another, currently unknown, business partner - developed a rail system that allows the projectors to be moved in and out if there's either a full-frame film print available or a digital-only release.
These theaters were prepared in time for the release of "The Dark Knight Rises" in July 2012.