FXTD® Contact Us

← Tools

Tools / Desktop app

RUDRA

Turn SDR images and footage into HDR. Reconstruct, grade, and export in one desktop app.

Download the beta ↓Read the user guide Installation, first render and export
0.9.0 beta 226 September 2026
Windows + macOSDesktop downloads
LinuxBuild from source
Non-commercialEvaluation release
RUDRA on macOS with an illustrative split-view HDR edit of a cow in a field
RUDRA on macOSSelect the image to view full size.

Download RUDRA

Desktop beta 2 includes a highlight-grain correction. Choose your platform.

This beta is not code-signed on Windows or notarised on macOS. Read the release notes for installation details and known limitations. Movie workflows require FFmpeg and FFprobe. On macOS, use FFmpeg 6.1 as described in the release notes. Still images need no extra tools.

The current code uses PolyForm Noncommercial 1.0.0. Model weights have separate non-commercial terms. Check both licenses before use.

Learn RUDRA

Install the app, make your first HDR image, and learn how to export your work. The guide also covers model training and common questions.

Read the user guide ↗ Your first render →

Built for HDR work

Reconstruct and grade

Adjust recovery strength, compare results, and review highlights with scopes and false colour.

Images and footage

Work with stills, image sequences, and movies in a native desktop workspace.

Deliver your master

Export ACES 2065-1 EXR sequences, HDR10, HLG, or ProRes 422 HQ.

From SDR to HDR

An SDR image can lose highlight detail through clipping. Expanding its brightness alone cannot restore that detail.

RUDRA uses HDR training references to infer plausible highlights. Reconstruction estimates missing detail rather than recovering a unique original scene.

SCENE LUMINANCE → CLIP: 1.0 RUDRA SDR MASTER DETAIL DISCARDED HERE
Everything the SDR master folded onto 1.0 is what RUDRA has to infer

Before and after

Drag each divider or use the arrow keys. Source on the left, RUDRA on the right.
01: Table Mountain, sun on the horizonSource · RUDRA
Source plate: the sun is a flat pale patch welded into the sky
Same plate after RUDRA: the sun disc and flare are reconstructed
SourceRUDRA sun clipped flatsun disc + flare reconstructed

The reconstructed result adds a defined sun disc and flare while retaining foreground detail.

ReconstructedSun disc + flare
ForegroundHolds detail
OutputScene-linear EXR
02: Hillside road at duskSource · RUDRA
Source plate: the dusk sky has collapsed to a flat grey field
Same plate after RUDRA: cloud structure and warmth return to the sky
SourceRUDRA sky welded to greycloud detail + warm gradient

Cloud structure and a warm horizon appear in the reconstruction while the road and foliage retain depth.

ReconstructedCloud banks
HorizonWarmth restored
ShadowsDensity held
03: Cumulus over a quarrySource · RUDRA
Source plate: bright cumulus tops merged into one white mass
Same plate after RUDRA: modelling returns inside the bright cloud
SourceRUDRA cloud tops merged whiteform holds in the brights

The reconstruction adds shape within bright clouds while retaining blue in the sky.

ReconstructedCloud modelling
SkyBlue holds
SequencesTemporal refiner
Download RUDRA ↓ Release notes ↗ Report an issue ↗