HEIC to QOI: conversion guide

Source · HEIC
Target · QOI

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What happens when you convert HEIC to QOI?

Multiple source images

HEIC 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.

Animation becomes a still

An animated HEIC has a timed sequence; QOI is a still-image destination in this workflow. A still export loses motion and timing. Frame choice, blending and disposal must be defined by the future engine; a first-frame export is not promised.

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.

HEIC

Source

HEIC

High Efficiency Image File Format (HEVC)

Compression: Lossy & losslessTransparency: YesMetadata: Exif, XMP, ICC, NCLX

HEVC-coded photographs in HEIF, with room for auxiliary images and capture metadata.

Explore HEIC 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 HEIC → QOI right for you?

Good choice when

  • QOI fits your delivery use: Application assets & simple decoding.
  • You can choose the source image or part needed for delivery.
  • You want a still illustration from an animated source.
  • You need an SDR delivery copy and can review its tone mapping.

Probably not when

  • You require a complete collection, page set or multipart round trip.
  • Motion, frame timing or loop behaviour must survive.
  • You need the original HDR range for relighting or grading.
  • You assume format-level alpha support guarantees matching transparent edges.

HEIC to QOI conversion details

Multiple source images
HEIC 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.
Animation becomes a still
An animated HEIC has a timed sequence; QOI is a still-image destination in this workflow. A still export loses motion and timing. Frame choice, blending and disposal must be defined by the future engine; a first-frame export is not promised.
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
HEIC: Lossy & lossless → QOI: Lossless HEIC: HEIC commonly uses lossy HEVC; HEVC also has lossless coding tools. Actual quality, bit depth and chroma depend on the encoded profile and settings, not on the .heic extension. 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
HEIC: Yes → QOI: Yes
Animation
HEIC: Yes → QOI: No
Colour depth
HEIC: Codec/profile dependent → QOI: 8 bits/sample
HDR
HEIC: Codec/profile dependent
Multiple images
HEIC: Collections & sequences
Dimensions
Pixel dimensions, page geometry, rendering resolution, resizing and orientation need explicit converter policies. The future engine has not defined them yet.
Metadata
HEIC: Exif, XMP, ICC, NCLX → 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 every source image be exported?

HEIC 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.

Will the output keep animation?

An animated HEIC has a timed sequence; QOI is a still-image destination in this workflow. A still export loses motion and timing. Frame choice, blending and disposal must be defined by the future engine; a first-frame export is not promised.

How will HDR brightness be mapped?

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.

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?

HEIC: Exif, XMP, ICC, NCLX → QOI: Colour-space flag. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.