Video Formats and Their Uses

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However, “the best” format depends on the purpose: cinema projection, websites, streaming, YouTube, and archiving do not always use the same resolution and aspect ratio.

Overview of the most important formats

Name Aspect Ratio Resolution Typical Use
SD / PAL 4:3 720 × 576 older TV standard, DVD
HD / 720p 16:9 1280 × 720 older web videos, smaller files
Full HD / 1080p 16:9 1920 × 1080 Web, Blu-ray, TV
4K UHD / 2160p 16:9 3840 × 2160 Web, streaming, TV, modern cameras
DCI 2K Full approx. 1.90:1 2048 × 1080 digital cinema
DCI 2K Flat 1.85:1 1998 × 1080 cinema, “flat” widescreen
DCI 2K Scope 2.39:1 2048 × 858 very wide cinema aspect ratio
DCI 4K Full approx. 1.90:1 4096 × 2160 digital cinema, 4K DCP
DCI 4K Flat 1.85:1 3996 × 2160 digital cinema
DCI 4K Scope 2.39:1 4096 × 1716 digital cinema, Cinemascope

The DCI cinema specification defines a 4K container size of 4096 × 2160 pixels. Depending on the aspect ratio, this container is used for formats such as Flat (3996 × 2160) and Scope (4096 × 1716) pixels, among others. Wikipedia

The two formats you are asking about

1. Professional cinema format: DCI 4K

The actual professional digital cinema format is usually called:

DCI 4K – 4096 × 2160 pixels

The aspect ratio is approximately 1.90:1. In practice, however, a finished feature film is usually not simply delivered in this full container, but rather as a DCP in one of the standard cinema formats:

Cinema format Aspect ratio 4K resolution Character
4K Full approx. 1.90:1 4096 × 2160 full DCI container
4K Flat 1.85:1 3996 × 2160 classic widescreen
4K Scope 2.39:1 4096 × 1716 very wide Cinemascope image

For a standard theatrical film, 4K Flat and 4K Scope are the most important formats. DCPs are typically created as standardized theatrical packages containing JPEG-2000 image data and matching theatrical audio.

2. Best 16:9 Format: 4K UHD

This format is usually the most practical for websites, YouTube, streaming, presentations, and modern TVs:

4K UHD – 3840 × 2160 pixels – 16:9

Technically, it is not the same as DCI 4K. DCI 4K is 4096 × 2160, while 4K UHD uses 3840 × 2160. UHD matches the common 16:9 aspect ratio exactly; DCI 4K is slightly wider.

For 16:9, the following applies:

38402160=1.777…≈169\frac{3840}{2160}=1{,}777\ldots \approx \frac{16}{9}21603840​=1.777…≈916​

Practical Recommendation

Target Recommended working or export resolution
Theatrical Screening 4096 × 2160, 3996 × 2160, or 4096 × 1716 as a DCP
High-quality website 3840 × 2160, 16:9
YouTube or streaming 3840 × 2160, 16:9
Good compatibility and smaller file sizes 1920 × 1080, 16:9
Archive Master Highest-quality original possible, ideally 4K or higher
Portrait orientation for smartphones 2160 × 3840 or 1080 × 1920
Cinemascope aesthetics on the web 3840 × 1600 or 3840 × 1620; not to be confused with DCI Scope

Summary for your website

The most important video formats

The professional digital cinema format is called DCI 4K and uses a container with 4096 × 2160 pixels. For theatrical screenings, depending on the aspect ratio, 4K Flat with 3996 × 2160 pixels and an aspect ratio of 1.85:1 or 4K Scope with 4096 × 1716 pixels and an aspect ratio of 2.39:1 are primarily used.

For websites, streaming, YouTube, and modern televisions, 4K UHD with 3840 × 2160 pixels is the recommended 16:9 format. It is often simply called “4K,” but technically it differs from the slightly wider DCI-4K cinema format.

The general recommendation is therefore: 3840 × 2160 pixels for 16:9 web and streaming video, and 4096 × 2160 pixels or a suitable 4K DCP for digital cinema.

An important practical tip: If your source material is actually 16:9, you shouldn’t artificially stretch it to 4096 × 2160. For a website or streaming platform, 3840 × 2160 remains the correct 16:9 output. For a cinema DCP, the material is then appropriately placed into a DCI container, with narrow black bars if necessary.




 

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