C’est de l’IMAX avec deux projecteurs laser.
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In April 2012, IMAX began testing a new 4K laser projection system, based on patents licensed from Eastman Kodak. Like the 3D film and digital systems, it used two projectors, but it improved over the smaller digital screens by retaining the traditional IMAX aspect ratio and let films be shown on screens 36 m (118 ft) wide or more.[43] In December 2014, IMAX began rolling out its new Dual 4K laser projector system, dubbed "IMAX with Laser", with the first installation occurring at the Cineplex ScotiaBank Theatre in Toronto.[44][45] The system allows digital projection on the full 1.43:1 aspect ratio surface of a traditional IMAX screen, but can also be used on wider screens such as the 1.90:1-aspect-ratio TCL Chinese Theater.
The system replaces the xenon arc lamp of a traditional digital projector with a laser light source, and is capable of 60 fps with "50 percent greater" brightness than the Digital Cinema Initiatives spec, a contrast ratio "double" that of IMAX 15/70mm film projection and "higher" than the 2500:1 contrast ratio of IMAX's xenon lamp-based projection systems, and displaying the full Rec. 2020 color gamut/space. The system also features a new 12-channel surround sound system, which adds an additional speaker on either side of the theater as well as four new overhead speakers.[46][47]
While still not matching the theoretical resolution of traditional IMAX film, which is estimated at up to 12 thousand lines of horizontal resolution on the 65mm camera negative (12K) and approximately 6 thousand on a 35mm release print (6K),[20] the new laser system features dual-4K resolution projectors, each capable of displaying four times the detail of one Digital IMAX projector. Like Digital IMAX, images from the two projectors are projected superimposed on each other with a half-pixel offset, using super-resolution imaging, which makes the perceived resolution greater than 4K.[48] In-theater cameras and microphones are used to automatically calibrate the projectors and sound system between showings.[49] For 3D presentations, one projector is used to display the image for each eye, while 2D presentations use the superimposed images to allow for a brighter image.[47] For 3D presentations, IMAX with Laser systems use dichroic filter glasses, similar to those used by Dolby 3D, as opposed to the linear polarization glasses used in Digital IMAX theaters.[50]
On April 24, 2018, IMAX announced that they would begin rolling out a new single-unit version of their laser projector system later that year, with this iteration designed to replace the IMAX Xenon digital projection system for 1.90:1 screens.[51]
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