Understanding
Why does IMAX look so much better? What's the real difference between “filmed for IMAX” and “shot on IMAX film”? Why can 1080p look like 4K? And how big is a single movie file at the theatre?
A practical, no-fluff guide from CinemaView. Once you understand the format, jump into the seat simulator to see it from any seat.
What is IMAX?
IMAX (Image Maximum) isn't just a bigger screen - it's an end-to-end system designed for the most immersive image possible. The camera, film stock, projector, screen geometry, and sound system are all engineered together.
Founded in 1967 in Canada, IMAX originally used enormous 15-perf 70mm film - each frame about 10× larger than standard 35mm. The film runs horizontally through the projector, allowing a far larger image area per frame.
💡 Key Insight
A single frame of IMAX 15/70mm film holds roughly the detail of 18K resolution. For comparison, your 4K TV displays about 8.3 million pixels.
IMAX 15/70mm
Film Projector
IMAX Laser
Dual 4K Laser
IMAX Digital
Dual 2K Xenon
Filmed FOR vs. WITH vs. ON IMAX
Not all “IMAX” movies are created equal. There are three distinct tiers of how a film can be associated with IMAX, and the difference is massive.
Filmed FOR IMAX
Most CommonIMAX DMR (Digital Media Remastering)
A standard movie (shot on 35mm or digital) is digitally remastered - colour graded, sharpened, and sometimes reframed - to look better on IMAX screens. Think of it as an enhanced upscale rather than a native capture.
Examples: The Avengers, Spider-Man: No Way Home, Doctor Strange 2
Filmed WITH IMAX Cameras
PremiumIMAX-Certified Digital Cameras
Shot using IMAX-certified digital cameras (like the ARRI Alexa IMAX or Panavision DXL2). The film is captured at higher resolution with IMAX-optimised lenses, delivering genuinely superior clarity and an expanded aspect ratio.
Examples: Dune: Part Two, No Time to Die, Top Gun: Maverick
Shot on IMAX Film
The Holy Grail15-perf 70mm IMAX Film
The absolute pinnacle. Shot on massive 65mm / 70mm IMAX film with 15 perforations per frame - each frame roughly 10× the size of standard 35mm. This produces an image with a digital equivalent of ~18K resolution. Only a handful of directors still shoot this way.
Examples: Oppenheimer, Interstellar, Dunkirk, The Dark Knight
The IMAX Screen
IMAX screens aren't just wider - they're designed to fill your entire peripheral vision. See exactly how that scale plays out in our movie screen size guide.
Aspect Ratios - what you actually see
A taller ratio means more image area and a more enveloping experience.
Up to 40% more image- when a film shot in IMAX 1.43:1 switches from widescreen scenes to IMAX sequences, the image literally “opens up” to fill the screen's full height. This is the famous “expanding frame” effect in Oppenheimer and Interstellar.
The Resolution Myth: Why 1080p Can Look Like 4K
Resolution is just the grid size. What actually determines image quality is how much data fills each pixel - and that's called bitrate.
🔍 Think of it like a canvas
Resolution = how many dots you can place on the canvas. Bitrate = how much paint you put into each dot. A 1080p image at 250 Mbps has 50× more data per pixel than a 5 Mbps Netflix stream.
⚡ The theatre advantage
Digital Cinema Packages use JPEG 2000 compression - so high-quality it's essentially visually lossless. Even at 2K, a DCP can look better than 4K streaming.
Bitrate: The Real Quality Metric
Bitrate measures how much data is used per second of video. Higher bitrate = more detail, smoother gradients, fewer artifacts. Here's how formats compare:
IMAX film has no fixed bitrate- it's analog. But when digitised, a single IMAX frame contains around 12 gigapixels of data. At 24fps that's roughly 12,000 Mbps of equivalent throughput.
Data per pixel comparison
Same resolution, massively different quality
Netflix 1080p
~0.08
bits per pixel
Blu-ray 1080p
~0.6
bits per pixel
Cinema DCP 2K
~4.5
bits per pixel
How Big Is a Movie at the Theatre?
Theatre movies aren't streamed - they're delivered on encrypted hard drives (CRU drives) or via satellite. Typical file sizes for a 2.5-hour feature:
Netflix Movie
Heavily compressed H.264/H.265
3-7 GB
Blu-ray Disc
Lossless audio, high-quality video
25-50 GB
Cinema DCP
JPEG 2000, 2K or 4K, uncompressed audio
150-300 GB
IMAX DCP
Dual 4K streams, lossless, shipped on drives
500 GB - 1 TB
| Property | Standard | IMAX Digital | IMAX Laser |
|---|---|---|---|
| Resolution | 2K (2048×1080) | 2K×2 (dual) | 4K×2 (dual) |
| Brightness | 14 fL | 22 fL | 30+ fL |
| Contrast Ratio | 2000:1 | 3000:1 | 8000:1+ |
| Colour Gamut | DCI-P3 | DCI-P3 | Rec. 2020 |
| Sound | 5.1 / 7.1 | 12-ch IMAX | 12-ch IMAX |
| DCP Size | ~200 GB | ~400 GB | ~1 TB |
Inside IMAX with Laser
Unlike a single xenon-bulb projector, IMAX with Laser uses a dual-projector engine that splits light into red, green, and blue laser arrays, recombined with precision optics. The result: higher brightness, a wider colour gamut (Rec. 2020), and 8000:1 contrast.
Keep reading
Frequently Asked Questions
What is the difference between IMAX Digital and IMAX Laser?
IMAX Digital (xenon) retrofits standard theatres with dual 2K resolution lamps. IMAX with Laser uses advanced laser light engines to produce full native 4K resolution, around 10× the contrast, and nearly double the brightness, allowing it to fill giant GT screens.
What does 'Shot in IMAX' actually mean?
Historically it meant shooting on massive 15/70mm physical film reels. Today it often means the filmmakers used high-end IMAX-certified digital cameras (like the ARRI Alexa IMAX). Only these sequences offer the taller expanded aspect ratios (1.43:1 or 1.90:1).
Is IMAX sound better than Dolby Atmos?
IMAX sound uses a custom 12-channel surround system centred on powerful subwoofers for physical bass. Dolby Atmos uses object-based sound with up to 64 speaker feeds including overhead channels. Dolby is more precise and directional, while IMAX is louder and more visceral.
Where should you sit for the best IMAX view?
Sit in the centre column, roughly two-thirds of the way back from the screen (usually rows 8 through 11). This gives the ideal field of view to absorb the taller screen comfortably without neck strain.
Ready to find the best seat in the house?
Now that you understand the technology, use CinemaView to preview exactly how the screen looks from every seat - in IMAX, Dolby Cinema, ScreenX, and more.
Launch CinemaViewThis guide is for educational purposes. IMAX® is a registered trademark of IMAX Corporation. Data sourced from IMAX technical specifications and industry publications.