Sigma X3F to HDR: conversion guide

Source · Sigma X3F
Target · HDR

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What happens when you convert Sigma X3F to HDR?

RAW development

Sigma X3F needs camera- and file-aware development to produce a rendered HDR image. White balance, exposure, camera colour interpretation and, where applicable, demosaicing determine that rendering. The destination does not retain the original RAW development latitude. No development settings or camera support are implemented yet.

Developing into an HDR workspace

RAW capture values are not automatically a finished SDR or HDR picture. An HDR-capable destination can hold a developed high-range image, but exposure, camera calibration, colour space and highlight handling determine which captured information reaches it. The future engine defines that development; neither sensor values nor a wider dynamic range are guaranteed to survive.

Lossless sample storage

RLE preserves stored RGBE bytes; RGBE quantization is not exact storage of arbitrary float RGB. The .hdr format is distinct from the general concept of HDR photography. HDR 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.

Sigma X3F

Source

Sigma X3F

Sigma X3F Raw

Compression: Depends on variantTransparency: NoMetadata: Capture metadata

Sigma raw capture for compatible Foveon-camera workflows, developed with sensor-aware software.

Explore Sigma X3F format →
HDR

Target

HDR

Radiance HDR / RGBE

Compression: LosslessTransparency: NoMetadata: Radiance header, EXPOSURE, FORMAT

Radiance pictures with a shared exponent for high-dynamic-range lighting values.

Explore HDR format →

Is Sigma X3F → HDR right for you?

Good choice when

  • HDR fits your delivery use: Lighting environments & radiometry.
  • You need a developed image for a non-RAW application.
  • You need a developed image for an HDR working pipeline.
  • You need lossless storage of the rendered samples supported by HDR.

Probably not when

  • You need the original sensor data and freedom to redevelop it.
  • You need untouched camera samples rather than a rendered image.
  • You expect lossless encoding to restore lost details or editing structure.
  • You require identical samples without a defined colour and precision policy.

Sigma X3F to HDR conversion details

RAW development
Sigma X3F needs camera- and file-aware development to produce a rendered HDR image. White balance, exposure, camera colour interpretation and, where applicable, demosaicing determine that rendering. The destination does not retain the original RAW development latitude. No development settings or camera support are implemented yet.
Developing into an HDR workspace
RAW capture values are not automatically a finished SDR or HDR picture. An HDR-capable destination can hold a developed high-range image, but exposure, camera calibration, colour space and highlight handling determine which captured information reaches it. The future engine defines that development; neither sensor values nor a wider dynamic range are guaranteed to survive.
Lossless sample storage
RLE preserves stored RGBE bytes; RGBE quantization is not exact storage of arbitrary float RGB. The .hdr format is distinct from the general concept of HDR photography. HDR 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.
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
Sigma X3F: Depends on variant → HDR: Lossless Sigma X3F: Sigma documents X3F development through Photo Pro and in-camera JPEG processing on supported models. The related X3I format is a different multi-capture representation in the sd Quattro workflow. Neither the layered sensor concept nor several captures imply a Photoshop layer stack in every X3F. HDR: RLE preserves stored RGBE bytes; RGBE quantization is not exact storage of arbitrary float RGB. The .hdr format is distinct from the general concept of HDR photography.
Colour depth
Sigma X3F: Camera and recording mode → HDR: 32-bit RGBE / XYZE pixel
HDR
HDR: Radiometric values
Sensor data
Sigma X3F: Raw development required
Dimensions
Pixel dimensions, page geometry, rendering resolution, resizing and orientation need explicit converter policies. The future engine has not defined them yet.
Metadata
Sigma X3F: Capture metadata → HDR: Radiance header, EXPOSURE, FORMAT. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.

Common questions

Will HDR still be an editable camera RAW?

Sigma X3F needs camera- and file-aware development to produce a rendered HDR image. White balance, exposure, camera colour interpretation and, where applicable, demosaicing determine that rendering. The destination does not retain the original RAW development latitude. No development settings or camera support are implemented yet.

Will RAW to HDR preserve the original sensor values?

RAW capture values are not automatically a finished SDR or HDR picture. An HDR-capable destination can hold a developed high-range image, but exposure, camera calibration, colour space and highlight handling determine which captured information reaches it. The future engine defines that development; neither sensor values nor a wider dynamic range are guaranteed to survive.

Does lossless output mean an unchanged source?

RLE preserves stored RGBE bytes; RGBE quantization is not exact storage of arbitrary float RGB. The .hdr format is distinct from the general concept of HDR photography. HDR 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.

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?

Sigma X3F: Capture metadata → HDR: Radiance header, EXPOSURE, FORMAT. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.