Over EXR-bestanden

EXR (OpenEXR Image · Afbeeldingsformaat)

Uitgebracht 1999 Door Industrial Light & Magic

OpenEXR Image (.exr) is een standaard bestandsformaat dat door KaijuConverter wordt ondersteund voor gegevensuitwisseling, archivering en platformonafhankelijke conversie.

Categorie

Raster & Vector Images

Extensie

.exr

MIME-type

image/x-exr

Bruikbaar als

Invoer Uitvoer

Het verhaal

HOE EXR
IS ONTSTAAN.

1999

2003

2007

OpenEXR was developed internally at Industrial Light & Magic starting in 1999 and released as open source in 2003 alongside the VFX work on the Harry Potter films. The format was built to solve a problem that had no good answer: how do you store a pixel with genuinely unbounded brightness? Film negatives and real-world light have no fixed ceiling — a 16-bit integer simply couldn’t represent a sunlit cloud next to a dark corner.

EXR’s answer was 16-bit and 32-bit floating point per channel, half-float values that could represent from 6×10⁻⁸ to 65 504 and full-float values that went essentially infinite. Paired with Wavelet and PIZ compression schemes, EXR became the backbone of every major VFX and 3D rendering pipeline: Disney, Pixar, Weta, DreamWorks, ILM. It even won an Academy Sci-Tech Award in 2007. If you’ve seen a modern CGI film, you’ve watched thousands of EXRs.

WEETJES &
TRIVIA.

OpenEXR won the 2007 Academy Sci-Tech Award for Scientific and Technical Achievement — the Oscar for codecs.

Every frame of The Lord of the Rings: Return of the King post-production pipeline was an EXR.

A single EXR can carry dozens of "channels" — RGB, alpha, depth, motion vectors, normals, albedo, specular — all as first-class citizens.

EXR supports "deep" variants that store multiple samples per pixel for transparent-object compositing — a feature unique to the format.

A 4K half-float EXR with typical VFX channels can easily exceed 300 MB — one frame.

STERKE PUNTEN &
BEPERKINGEN.

Sterke punten

Genuine high-dynamic-range storage (32-bit float per channel).
Multi-channel layers native — store an entire render pass in one file.
Industry standard across every major VFX and animation studio.
Deep samples enable modern compositing workflows.
Open-source reference implementation with mature tooling.

Beperkingen

Enormous file sizes.
Not a web format — browsers don't display EXR.
Decoding is CPU-intensive.
Consumer apps rarely need HDR at this precision.

Typische bestandsgroottes

1080p half-float with alpha

15-25 MB

4K multichannel VFX render

200-500 MB

8K deep EXR (heavy comp)

1-4 GB per frame

Technische specificaties

MIME type: image/x-exr
Extension: .exr
Bit depths: 16-bit half-float, 32-bit float, 32-bit uint
Compression: ZIP, PIZ, PXR24, B44, DWAA, DWAB, RLE, None
Max channels: Practically unlimited (arbitrary named layers)

CONVERTEER VANUIT
EXR

exr jpg exr png exr webp exr avif exr gif exr bmp exr tiff exr ico exr pdf

CONVERTEER NAAR
EXR

jpg exr png exr webp exr gif exr bmp exr tiff exr

Veelvoorkomende toepassingen

VFX, HDR photography, film