Convert any SDR video to HDR - Easy ComfyUI Workflow

Convert any SDR video to 16-bit HDR EXR in ComfyUI using LTX 2.3 and the HDR IC-LoRA. Works on real camera footage, AI-generated video, stock clips — any SDR source. Free, clean, subgraphed workflow.

⬇️ FREE WORKFLOW DOWNLOAD → [https://comfycompositing.com/workflows]
🔧 CUSTOM NODES (GitHub) → https://github.com/rik-python/ComfyCompositing-ltx-aces

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📺 PREVIOUS VIDEO — Image to HDR EXR (LTX 2.3)
→ [https://youtu.be/BdhtIjWZGHc?si=tN6f1VMoruFQdGqO]

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📦 MODELS — Download & Where to Put Them

1. LTX 2.3 22B (main model + VAE)
→ https://huggingface.co/Lightricks/LTX-Video
→ Place in: ComfyUI/models/checkpoints/

2. LTX 2.3 Distilled LoRA
→ https://huggingface.co/Lightricks/LTX-Video
→ Place in: ComfyUI/models/loras/ltxv/ltx2/

3. LTX 2.3 HDR IC-LoRA (the key model)
→ https://huggingface.co/Lightricks/LTX-2.3-22b-IC-LoRA-HDR
→ Place in: ComfyUI/models/loras/ltxv/ltx2/

4. Gemma 3 12B Text Encoder
→ https://huggingface.co/Lightricks/LTX-Video
→ Place in: ComfyUI/models/text_encoders/

No separate VAE needed — it's built into the main checkpoint.

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🔧 HOW TO INSTALL THE WORKFLOW

1. Open ComfyUI and make sure it is up to date.
2. Drag and drop the workflow file onto the canvas.
3. You might see missing custom nodes — go to the Extensions menu and hit Install Missing Custom Nodes.
4. Select all that are missing and hit Update.
5. Restart ComfyUI — you should be good to go.

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🖥️ VRAM — LOW VRAM OPTIONS (GGUF)

If you're running low VRAM, use GGUF quantised models instead of the full safetensors.
Download from: https://huggingface.co/city96/LTX-Video-gguf
Requires ComfyUI-GGUF custom node.

| VRAM | Use this |
| 24 GB+ | Full safetensors |
| 16–24 GB | Q6_K or Q8_0 GGUF |
| 12–16 GB | Q4_K_M GGUF |
| 8–12 GB | Q3_K_M GGUF |

See the workflow guide (included in the download) for exact setup steps.

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🔗 LINKS

Comfy Compositing Website → [https://comfycompositing.com/]
GitHub (Custom Nodes) → https://github.com/rik-python/ComfyCompositing-ltx-aces
LTX 2.3 HDR IC-LoRA (Lightricks) → https://huggingface.co/Lightricks/LTX-2.3-22b-IC-LoRA-HDR

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Видео Convert any SDR video to HDR - Easy ComfyUI Workflow канала Comfy Compositing