Here is the updated description with your specific tuning logic integrated. I’ve refined the "Tech Stack" and "How to Use" sections to reflect exactly why you built it this way.<hr />Workflow Title: Z-Image Turbo + SeedVR2 Cinematic UpscalerBottom Line: This is a high-performance workflow designed to squeeze out maximum fine detail. It pairs Z-Image Turbo generation with a hybrid upscale pipeline: SeedVR2 provides the heavy lifting for structure, followed by an SD1.5 LCM pass to enforce photorealism.<h3 id="the-tech-stack">The Tech Stack</h3><ul><li>Base Model: Z-Image Turbo (bf16)</li><li>Text Encoder: Qwen 3.4B + Lumina2 (CLIPLoader)</li><li>Sampler: ClownsharKSampler_Beta (Linear / Ralston 2s) for speed.</li><li>Upscaler 1 (Structure): SeedVR2 (Video/Image Upscaler) using <code>seedvr2_ema_7b</code> to hallucinate high-fidelity details.</li><li>Upscaler 2 (Realism): Ultimate SD Upscale using an SD1.5 LCM model. This pass lightly touches the SeedVR2 output to ground it in realism and micro-texture.</li><li>Alternative Path (Spectral): Spectral VAE Detailer. See usage note below.</li><li>Post-Process: Built-in LUT application (Film Print) + Film Grain + CA Sharpening.</li></ul><h3 id="key-features">Key Features</h3><ul><li>Hybrid Detail Engine: Uses SeedVR2 for the "big picture" upscale and SD1.5 LCM for the "reality check," creating a look that is both high-resolution and texturally grounded.</li><li>Conditional Spectral Pass: Includes a Spectral VAE path specifically for high-res base outputs (2.5MP+). This allows for a quick detail boost without needing a full upscale cycle.</li><li>Cinematic Grading: End-of-pipe processing includes <code>ImageApplyLUT+</code> and <code>AddGrain</code> nodes to bake in a cinematic, analog feel immediately.</li><li>Comparison Ready: Pre-rigged with rgthree Image Comparers at every stage so you can fine-tune settings instantly.</li></ul><h3 id="requirements-(custom-nodes)">Requirements (Custom Nodes)</h3>You will need ComfyUI Manager to fetch missing nodes, but specifically ensure you have:<ul><li>SeedVR2 Custom Nodes (Large model download required).</li><li>rgthree-comfy (For the relay switches and comparers).</li><li>ComfyUI_Essentials (For LUTs and sharpening).</li><li>Spectral VAE Detailer.</li></ul><h3 id="how-to-use-and-tuning-tips">How to Use &amp; Tuning Tips</h3><ol><li>Load Models: Ensure <code>z_image_turbo_bf16.safetensors</code>, <code>qwen_3_4b</code>, and the <code>seedvr2</code> models are in their respective paths.</li><li>Primary Upscale: The standard path runs SeedVR2 → SD1.5 LCM. This delivers the most realistic results.</li><li>Spectral Pass (Quick Boost): If you are generating a high-resolution base (e.g., 2.5MP+) and want to skip the heavy upscalers, toggle the Spectral VAE Detailer.<ul><li>Tip: This adds quick extra details to a high-res input. Play with the <code>sigma</code> value for intensity, but do not go over 0.400 or you risk artifacting.</li></ul></li><li>Manage Switches: Use the Fast Groups Bypasser nodes to toggle the <code>upscale</code> (SeedVR2) or <code>Quick Detail</code> (Spectral) paths.</li></ol>

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