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DCI 4K
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DCI 4K

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DCI 4K is the Digital Cinema Initiatives standard for theatrical distribution with 4096 × 2160 pixels and an aspect ratio of approximately 1.90:1.

Overview

DCI 4K refers to the resolution standard for digital cinema, defined by the Digital Cinema Initiatives (DCI) – an alliance of major Hollywood studios (including Disney, Fox, Paramount, Sony, Universal, Warner Bros.) founded in 2002. DCI 4K is not lighting or grip equipment, but a container and format specification for theatrical distribution. The specifications are anchored in the Digital Cinema System Specification (DCSS) and standardized by SMPTE standards (SMPTE 428 series).

The DCI 4K container has a horizontal resolution of 4096 pixels. This distinguishes it from the consumer and broadcast standard UHD (3840 x 2160 pixels, aspect ratio 16:9), which applies to television and streaming. DCI 4K is wider and at home in the cinema workflow.

Technical Specifications

Container Resolution: 4096 x 2160 pixels (approx. 8.85 megapixels), aspect ratio ≈ 1.90:1 (exactly 256:135).

Within the container, two active image areas are standardized for projection:

FormatActive ResolutionAspect Ratio
Full Container4096 x 2160≈ 1.90:1
Flat3996 x 21601.85:1
Scope (CinemaScope)4096 x 1716≈ 2.39:1

For distribution as a Digital Cinema Package (DCP), the following are additionally specified:

  • Codec: JPEG 2000
  • Color Space: device-independent DCI XYZ

On-Set Usage

On set, DCI 4K is primarily relevant as a recording and delivery format. Many cinema cameras offer their own DCI 4K option (4096 px wide) alongside the UHD mode (3840 px wide). Those planning theatrical distribution shoot in DCI 4K to utilize the full cinema aspect ratio and wider image area; for TV and streaming delivery, however, UHD is the appropriate target.

The choice influences framing, cropping in post-production, and subsequent DCP creation. Since DCI 4K is slightly wider than UHD, camera, framing, and monitoring decisions on set must align with the planned final format (Flat 1.85:1 or Scope 2.39:1) to avoid unwanted cropping during mastering.

From the crafts

Perspectives

Cinematographer

Ich achte bei DCI 4K darauf, dass meine Kameraauflösung mindestens 20% über dem finalen Format liegt, um Flexibilität beim Reframing zu haben. Das XYZ-Farbformat erfordert präzise Kalibrierung meiner Monitore, da die Farbdarstellung anders als bei Rec.709 funktioniert. Die höhere Auflösung deckt jeden Fokus-Fehler gnadenlos auf, weshalb ich schärfere Objektive und präzisere Schärfenziehung brauche.

Director

DCI 4K erlaubt mir, auch in extreme Close-ups zu gehen, ohne dass die Bildqualität leidet, was besonders bei emotionalen Momenten wertvoll ist. Ich kann in der Post-Produktion ins Bild hineinzoomen oder Bildausschnitte verschieben, ohne sichtbare Qualitätsverluste. Die schärferen Details verstärken die Immersion des Publikums, verlangen aber auch perfekteres Production Design und Make-up.

Producer

DCI 4K verdoppelt meine Speicher- und Renderzeiten gegenüber 2K, was etwa 15-20% höhere Post-Produktionskosten bedeutet. Die Erstellung separater DCI- und UHD-Master kostet zusätzlich 8.000-12.000 Euro pro Film. Dafür sichert der Standard langfristige Verwertbarkeit in Premium-Kinos und rechtfertigt höhere Ticketpreise in PLF-Formaten wie IMAX oder Dolby Cinema.

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