LTX-2.3 IC-LoRA HDR for SDR to HDR Video

Take a regular SDR video and convert it to 16-bit HDR using LTX-2.3 and a dedicated HDR IC-LoRA.

Upload your footage, write a short prompt, and the workflow rebuilds your clip with expanded dynamic range. You get linear EXR frames ready to drop into a grading session, plus a tone-mapped SDR preview so you can see what came out without specialty software.

Built for color grading and finishing work, not fast previews.

How do you convert SDR video to HDR with LTX-2.3?

Upload your SDR clip, write a prompt that describes the scene (default is "HDR footage"), and the LTX-2.3 base model plus the HDR IC-LoRA convert each frame to 16-bit linear HDR encoded in ARRI LogC3. The workflow saves EXR frames for grading and a tone-mapped MP4 preview. Pick an exposure for the preview and run.

Input video Drop in any SDR footage. The workflow auto-pads to the nearest 8N+1 frame count and resizes to multiples of 32, so you don't need to fuss with dimensions. Bring a clip you want to grade, not a quick test.

Positive prompt Describe what's in the scene. The default "HDR footage" works for most clips. Add specifics about lighting (golden hour, neon-lit street, overcast morning) when you want the model to lean into a particular range, like bright highlights to roll off or deep shadows to recover. Keep it short. The HDR IC-LoRA already knows what HDR is.

Negative prompt Defaults steer away from flat, gamey, static output: "pc game, console game, video game, ugly, still, static, slow." Keep these unless you have a reason to override.

Exposure (preview only) Default 7.1. Range is ±10 EV in stops. Want to check shadow detail? Push it up. Want to see highlight roll-off? Pull it down. The catch: this only affects the SDR preview MP4. The EXR frames you save stay as untouched linear HDR.

Save EXR + output path On by default. The EXR frames are the actual deliverable for grading. The MP4 preview is there so you can sanity-check the output without DJV or another HDR-aware viewer.

Seed Fixed at 42 by default for reproducibility. Change it if a frame is misbehaving and you want a different roll. Same seed plus same input gets you the same output every time.

What is LTX-2.3 IC-LoRA HDR good for?

LTX-2.3 IC-LoRA HDR is a finishing tool. It expands SDR footage into 16-bit linear HDR encoded in ARRI LogC3, giving colorists more grading latitude to recover highlights, deepen shadows, and push saturation without breaking the image. Output is EXR frames ready for DaVinci Resolve, Nuke, or any HDR-capable color pipeline.

Use it on archival footage you want to push through a modern HDR delivery. Music videos and shorts where you want a film-like grade but only have SDR captures. Concept work where the look needs to land before the colorist picks it up.

When to skip it: doing a fast preview or a social clip going straight to a phone screen? You don't need linear EXR. A regular LTX-2.3 text-to-video or image-to-video workflow is a tighter fit. Working in a pure SDR delivery pipeline? The HDR conversion is overhead you won't use.

A note on speed: on an H100, expect about 100 seconds for 161 frames at full HD, and 152 seconds for 241 frames. Plan accordingly when batching shots.

FAQ

What is the HDR IC-LoRA for LTX-2.3? The HDR IC-LoRA is a Lightricks add-on for LTX-2.3 that swaps the model's output range from 8-bit SDR to 16-bit linear HDR encoded in ARRI LogC3. It works for video-to-video conversion and for fresh generations. Drop it in as a LoRA on top of the LTX-2.3 base.

Why does this workflow output EXR files? EXR is the standard container for linear HDR frames. It holds the full 16-bit range without clipping or banding, which is what colorists need. MP4 and PNG can't hold that range. Open the EXR sequence in DJV, DaVinci Resolve, or Nuke to see the full picture.

How long does LTX-2.3 HDR conversion take? On an H100, about 100 seconds for 161 frames at 1080p, and 152 seconds for 241 frames. The workflow rounds your input to the nearest 8N+1 frame count and resizes to multiples of 32. Longer clips and higher resolutions stretch the runtime proportionally.

Does the exposure slider change the saved EXR? No. Exposure adjusts the SDR preview MP4 only, in stops within ±10 EV. The linear HDR frames you save to EXR are untouched. That separation is intentional, so you can inspect the preview at different exposures without committing those changes to the deliverable.

How do you run LTX-2.3 IC-LoRA HDR online? You can run LTX-2.3 IC-LoRA HDR online through Floyo. No installation, no setup. Open the workflow in your browser, upload your SDR video, write a prompt, and hit run. EXR frames and an SDR preview come back in your run history. Free to try.