https://hermanity.dev/tags/image-gen/Recent content in Image-Gen on HermanHugoen-usWed, 01 Jul 2026 00:00:00 +0000https://hermanity.dev/projects/swarmui-image-gen/Wed, 01 Jul 2026 00:00:00 +0000https://hermanity.dev/projects/swarmui-image-gen/<h2 id="overview">Overview</h2> <p>A calibration and generation pipeline for local Stable Diffusion image generation. Talks to SwarmUI on a Windows rig with an NVIDIA 3090TI via HTTP API.</p> <h2 id="calibration-methodology">Calibration methodology</h2> <p>12 rounds of systematic A/B testing across 12 models:</p> <ul> <li><strong>Step sweeps</strong> — finding the sweet spot (Flux: 36 steps is perfect; Chroma: flat plateau 16-40)</li> <li><strong>CFG sweeps</strong> — Chroma sweet spot is 2.5-3.5; outside that drops to 3.0/5 quality</li> <li><strong>Cross-model comparisons</strong> — SDXL wins action/rain scenes at 5.0/5; Flux nails anime at 5.0/5</li> <li><strong>Single-sample trap</strong> — Round 11 found a &ldquo;winner&rdquo; on one prompt; Round 12 with 3 new prompts disproved it. Rule: n≥3 prompts per cell to change a default.</li> </ul> <h2 id="curated-defaults">Curated defaults</h2> <table> <thead> <tr> <th>Model</th> <th>Steps</th> <th>CFG</th> <th>Sampler</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td>flux1-dev-fp8</td> <td>36</td> <td>—</td> <td>euler/simple</td> <td>5.00/5 winner</td> </tr> <tr> <td>chroma_v10HD</td> <td>24</td> <td>3.0</td> <td>dpmpp_2m/beta</td> <td>Cap at 40 steps</td> </tr> <tr> <td>chroma1-base</td> <td>24</td> <td>3.0</td> <td>dpmpp_2m/beta</td> <td>Best for portraits</td> </tr> <tr> <td>sdxl_base</td> <td>36</td> <td>7.0</td> <td>dpmpp_2m/karras</td> <td>Flat plateau 36-60</td> </tr> </tbody> </table> <h2 id="hard-won-lesson">Hard-won lesson</h2> <p>Never trust a single-image calibration. A 1.0-point quality advantage on n=1 is noise. This methodology error almost became a permanent default change before a wider sweep caught it.</p>