LTX-2.5 IC LoRA for SDR to HDR

ABOUT THE WORKFLOW

Convert SDR Video to HDR
Upload any standard dynamic range (SDR) video and the workflow converts it to HDR with expanded color depth and dynamic range. No prompt needed. The model uses fixed scene embeddings to reconstruct the light your camera clipped, and returns an EXR frame sequence, an HLG master video, and a tonemapped preview.

Model

• LTX-2.5 22B Distilled by Lightricks. A 22-billion parameter video model with an IC-LoRA trained to convert SDR footage into 16-bit HDR, preserving motion, composition, and original audio.

HOW IT WORKS

Step 1. Upload your SDR video
Any standard dynamic range video file. The workflow reads resolution, frame rate, and audio track from the file.
Works great with: footage from phones · DSLRs · stock video · screen recordings

Step 2. Hit run
There is no prompt to write. The workflow uses fixed scene embeddings for conditioning. Leave all settings as-is and run.

Step 3. Download your HDR output
You get three outputs: an EXR frame sequence in ACEScg for grading, an HLG master video with your original audio, and a tonemapped sRGB preview for quick review.
Ready for: DaVinci Resolve · Nuke · Premiere Pro · Unity · Unreal

First time? Leave every setting as-is. The defaults (seed 42, CFG 1, euler sampler) are the right starting point for almost everyone.

RECOMMENDED SETTINGS

Quick-start guide. Find the goal that matches yours and copy the settings.

• Standard conversion (most people) — Seed: 42 · CFG: 1 · Sampler: euler · LoRA strength: 1. The right starting point for almost everyone.

• Want a different take on the same footage — Change the seed to any other number. Each seed produces a slightly different HDR interpretation.

• Need to adjust HDR brightness — Change the exposure value in the HDR postprocess step. 0 is neutral. Positive values brighten, negative values darken.

• Working with high frame rate footage — Frame rates above 30fps are automatically capped at 30 for conditioning. The output video keeps your original frame rate.

• Preview looks washed out or too dark — Check the tonemapped preview first. If highlights are clipped or shadows crushed, adjust the exposure value and re-run.

• Colors look off in your grading software — Make sure your project is set to ACEScg when importing the EXR sequence. Standard image viewers cannot display HDR EXR files correctly. Use DaVinci Resolve, Nuke, or DJV.

Prompt: None. This workflow uses no text prompt. The IC-LoRA relies on fixed scene embeddings to condition the HDR conversion. There is nothing to write or edit.

LEARN

📹 Videos

• Intro to Floyo

• ComfyUI 101 Free Course ft. Sebastian Kamph

• Floyo 101 for Team Collaboration

✨ Quick links

• Help docs

• LoRA Training guide

• Discover more workflows

USE CASES

🎬 Colorists & Post-Production
Convert flat SDR footage into HDR-graded deliverables with real linear EXR data, ready for DaVinci Resolve or Nuke.

🎮 Game & VFX Studios
Generate HDR environment footage and scene plates from SDR source material for integration into Unreal, Unity, or compositing pipelines.

📺 Broadcast & Streaming Delivery
Produce HLG masters from SDR archives for HDR streaming platforms and broadcast delivery without reshooting.

🎥 Independent Filmmakers
Upgrade phone and DSLR footage to HDR for festival submissions and distribution on HDR-capable platforms.

📦 Stock Footage Libraries
Batch-convert SDR catalog footage into HDR variants to serve the growing demand for HDR content.

WHAT WORKS BEST / WHAT TO AVOID

✅ Works great

• Well-exposed, evenly lit SDR footage

• Outdoor and interior scenes with clear tonal range

• Standard frame rates (24, 25, 30fps)

• Clean source footage without heavy compression artifacts

⚠️ May produce softer results

• Heavily overexposed or underexposed footage

• Extreme low-light or noisy video

• Highly compressed or artifacted source files

• Very long clips (generation time scales linearly with length)

FAQ

What is SDR to HDR video conversion and why does it matter?
SDR (standard dynamic range) video captures a limited range of brightness and color. HDR (high dynamic range) expands that range, recovering detail in highlights and shadows that SDR clips or flattens. Converting SDR to HDR matters for anyone delivering to HDR-capable displays, streaming platforms, or VFX pipelines where linear light data is required for compositing and grading.

How does LTX-2.5 convert SDR video to HDR?
The workflow uses a specialized IC-LoRA (In-Context LoRA) trained on top of the LTX-2.5 22B distilled model. It maps your SDR frames into ACEScct color space, then uses the diffusion model with fixed scene embeddings to regenerate each frame with expanded dynamic range in 8 steps. The result is real linear HDR data, not a LUT or curve adjustment.

What output formats does this workflow produce?
Three outputs: an EXR frame sequence in ACEScg color space for professional grading, an HLG (Hybrid Log-Gamma) master video with original audio muxed in, and a tonemapped sRGB preview video for quick review on standard displays. The EXR frames are 16-bit half-float by default.

Can I use the HDR output in DaVinci Resolve, Nuke, or Premiere Pro?
Yes. Import the EXR sequence into DaVinci Resolve with an ACEScg project color space, or load it into Nuke as linear EXR. For Premiere Pro, use the HLG master video directly. Standard image viewers cannot display EXR files correctly, so use DJV or your grading software to review the HDR frames.

Does this workflow preserve the original audio?
Yes. If your source video has an audio track, the HLG master muxes it back in. Silent videos stay silent. The tonemapped preview video also carries the original audio.

Is LTX-2.5 SDR to HDR free for commercial use?
LTX-2.5 is released under the LTX-2 Community License with open weights. Commercial use is free for organizations under $10M annual recurring revenue. Above that threshold, a commercial license from Lightricks is required.

How to run LTX-2.5 SDR to HDR online?
You can run LTX-2.5 SDR to HDR online through Floyo. No installation, no setup, no model downloads to manage. Open the workflow in your browser, upload your SDR video, and hit run. Free to try.

WHY FLOYO?

Floyo is the only platform with team collaboration for ComfyUI in the browser. You run workflows with no install. You share run history, assets, and models across your team. You pay only when you generate. Floyo supports open-source and closed-source models.

A colorist runs a conversion and likes the result. A producer opens that exact run from shared history and downloads the EXR sequence. No file handoffs. No version confusion.

For studios and enterprise teams, Floyo adds private workspaces, pooled resources, and a team usage dashboard. Other ComfyUI cloud tools run for one person at a time. Floyo runs for the whole team, with transparent per-generation costs.

Ready to try it?
Upload an SDR video and run it. No prompt needed, no settings to change.

→ Launch Workflow, Free

Questions? Watch the free course or check the FAQ above.