EXR to QOI: conversion guide

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What happens when you convert EXR to QOI?

EXR channels & deep data

An EXR may carry named auxiliary channels, multipart images or deep samples, beyond a flat RGB image. A rendered QOI copy is not an equivalent EXR working file. Channel selection, deep compositing and numeric mapping need explicit engine support; no export of every channel or depth sample is implemented.

Multiple source images

EXR can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.

HDR to SDR

If HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.

Lossless sample storage

QOI preserves 8-bit RGB/RGBA samples losslessly. Reducing 16-bit data or discarding profiles and metadata before encoding is outside that guarantee. QOI can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.

EXR

Source

EXR

OpenEXR

Compression: Lossy & losslessTransparency: YesMetadata: Typed header attributes, Chromaticities

HDR raster data for rendering and compositing, with named channels and lossless or lossy codecs.

Explore EXR format →

QOI

Target

QOI

Quite OK Image Format

Compression: LosslessTransparency: YesMetadata: Colour-space flag

A small lossless codec for 8-bit RGB and RGBA images, designed for simple, fast implementations.

Explore QOI format →

Is EXR → QOI right for you?

Good choice when

QOI fits your delivery use: Application assets & simple decoding.
You need a rendered view of selected EXR image data.
You can choose the source image or part needed for delivery.
You need an SDR delivery copy and can review its tone mapping.

Probably not when

You need every auxiliary channel or deep sample for compositing.
You require a complete collection, page set or multipart round trip.
You need the original HDR range for relighting or grading.
You assume format-level alpha support guarantees matching transparent edges.

Conversion considerations

An EXR may carry named auxiliary channels, multipart images or deep samples, beyond a flat RGB image. A rendered QOI copy is not an equivalent EXR working file. Channel selection, deep compositing and numeric mapping need explicit engine support; no export of every channel or depth sample is implemented.
EXR can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.
If HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.
The reviewed QOI representation uses 8-bit colour samples. If the source contains higher-precision samples, they must be reduced before encoding, even in a lossless output mode. Rounding, dithering and colour conversion are future engine decisions; lost precision cannot be recovered from this output.

EXR to QOI conversion details

EXR channels & deep data: An EXR may carry named auxiliary channels, multipart images or deep samples, beyond a flat RGB image. A rendered QOI copy is not an equivalent EXR working file. Channel selection, deep compositing and numeric mapping need explicit engine support; no export of every channel or depth sample is implemented.
Multiple source images: EXR can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.
HDR to SDR: If HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.
Transparency representation: Both format profiles allow transparency, but this does not promise identical alpha representation. Source variants, target channel precision and alpha interpretation matter. The future encoder must explicitly carry or convert transparency; merely choosing QOI guarantees no alpha transfer.
Lossless sample storage: QOI preserves 8-bit RGB/RGBA samples losslessly. Reducing 16-bit data or discarding profiles and metadata before encoding is outside that guarantee. QOI can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.
8-bit destination samples: The reviewed QOI representation uses 8-bit colour samples. If the source contains higher-precision samples, they must be reduced before encoding, even in a lossless output mode. Rounding, dithering and colour conversion are future engine decisions; lost precision cannot be recovered from this output.
Sample precision & colour: Source and target sample models can differ in precision, channel layout, colour space and transfer function. Lossless compression only preserves the samples actually encoded; a precision reduction or colour conversion can already change them. The future engine defines numeric mapping, orientation and colour conversion; canonical depth facts are listed below where available.
Metadata & colour: Format support does not guarantee that an export preserves metadata or colour profiles. Retention and colour handling depend on the future converter; its engine is not implemented yet.
Compression: EXR: Lossy & lossless → QOI: Lossless EXR: EXR supports lossy and lossless codecs. Choose one for the sample types and required precision; .exr alone does not guarantee exact channel preservation. QOI: QOI preserves 8-bit RGB/RGBA samples losslessly. Reducing 16-bit data or discarding profiles and metadata before encoding is outside that guarantee.
Transparency: EXR: Yes → QOI: Yes
Colour depth: EXR: HALF 16 / FLOAT 32 / UINT 32 → QOI: 8 bits/sample
HDR: EXR: Floating-point working values
Multiple images: EXR: Multipart
Dimensions: Pixel dimensions, page geometry, rendering resolution, resizing and orientation need explicit converter policies. The future engine has not defined them yet.
Metadata: EXR: Typed header attributes, Chromaticities → QOI: Colour-space flag. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.

Common questions

Will all EXR channels and deep samples survive?

Will every source image be exported?

How will HDR brightness be mapped?

Are bit depth and colour values guaranteed to match?

Source and target sample models can differ in precision, channel layout, colour space and transfer function. Lossless compression only preserves the samples actually encoded; a precision reduction or colour conversion can already change them. The future engine defines numeric mapping, orientation and colour conversion; canonical depth facts are listed below where available.

Will metadata and colour profiles be retained?

EXR: Typed header attributes, Chromaticities → QOI: Colour-space flag. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.