HDR Tool

Read and write Radiance HDR images with practical tone mapping controls for web preview.

What This HDR Tool Covers

This page is prepared for HDR workflow indexing and will host full read/write implementation for .hdr files, plus display-oriented tone mapping controls.

Supported HDR workflow scope

Input focus: Radiance .hdr sources used in rendering, lighting, panoramas, and image-based lighting workflows.
Output scope: HDR round-trip plus mapped preview outputs for web review and downstream validation.
Best fit: tone mapping checks, quick file inspection, and browser-based review of HDR assets.

When to use this tool

Open Radiance HDR files to inspect dynamic range and verify image content before conversion or delivery.
Tune exposure and tone mapping for SDR previews when HDR assets need human review.
Export derived previews or round-trip HDR outputs during lookdev and rendering support workflows.

Related tools

EXR Tool

Move to the EXR page when your HDR workflow includes OpenEXR files and channel inspection.

UltraHDR JPEG Tool

Use the UltraHDR page when the review target is gain-map based HDR delivery.

How To Open HDR Files Online

Read the HDR guide when the main question is browser-based tone mapping and preview of Radiance HDR files.

Planned Capabilities

Load .hdr files and inspect scene-linear image data ranges.
Export processed results back to .hdr with dynamic range retained.
Adjust exposure, gamma, and tone mapping operators for preview and output.

Planned Workflow

Import HDR source and parse image metadata.
Tune tone mapping parameters in linear color space.
Export HDR output or mapped preview output.

FAQ

Will this tool support round-trip HDR editing?

Yes. The implementation target is read + transform + write for Radiance HDR.

Is tone mapping only for display?

Primarily yes. Tone mapping is used for SDR preview and export decisions.

Will files be uploaded to a server?

No. The target behavior is fully local browser-side processing.