Logo generation
Spec
- Master: 1024×1024 RGBA PNG, transparent background, subject centered in 80% safe zone
- Vector: SVG, ≤200 paths, fixed viewBox, SVGO optimized
- Monochrome: 1-color mono variant (auto-derived via luminance threshold or separate generation)
- Wordmark routing — model-specific, not blanket:
- Paragraph-length OK:
gpt-image-2, gemini-3-pro-image-preview (Nano Banana Pro), gpt-image-1.5. Include the wordmark in the prompt; composite stays safer for pixel-exact UI copy.
- 3–10 words reliable:
ideogram-3 / ideogram-3-turbo, gemini-3.1-flash-image-preview (Nano Banana 2), gpt-image-1, flux-2 family.
- ≤3 words / ≤25 chars: Imagen 4 family, Recraft V4.
- Composite always: Flux 1.x, Flux Schnell, SDXL, SD 1.5, Mystic, Pollinations, original Nano Banana 1.
Routing by intent
| text in mark? |
vector needed? |
primary |
fallback |
| none |
yes |
Recraft V4 (native SVG) |
gpt-image-1.5 → BiRefNet → vtracer |
| none |
no |
gpt-image-1.5 (background:"transparent") |
Ideogram 3 Turbo (dedicated /v1/ideogram-v3/generate-transparent endpoint, rendering_speed:"TURBO") |
| 1–3 words |
yes |
Ideogram 3 → raster 1024 → BiRefNet → K-means(6) → vtracer → SVGO |
Recraft V4 |
| 1–3 words |
no |
Ideogram 3 |
gpt-image-1.5 |
| 4–10 words |
yes |
flux-2 / gpt-image-2 → raster 1024 → BiRefNet → K-means(6) → vtracer → SVGO |
Nano Banana Pro |
| 4–10 words |
no |
flux-2 family or gpt-image-2 (note: gpt-image-2 has no native RGBA — matte after) |
Nano Banana Pro |
| paragraph |
any |
Nano Banana Pro or gpt-image-2; composite is still safer for pixel-exact UI copy |
composite via BrandBundle.typography |
Dialect-ready prompt scaffold
A [flat vector | isometric | brutalist | soft gradient] logo mark representing [SUBJECT, concrete noun phrase].
Centered composition. Clean silhouette, strong tight outline, high contrast.
Palette: [#hex, #hex, #hex] strictly.
["WORDMARK TEXT" in sans-serif, tight tracking | text-free mark].
Solid pure white background. Square 1:1 aspect. 1024x1024.
For SD: prepend masterpiece, vector logo, flat design, minimalist, 8k, .
For Flux: drop all quality modifiers; be concrete about subject and palette.
Post-process
- BiRefNet matte (or Recraft SVG → rasterize at 1024).
- Checkerboard-pattern probe: reject if failed.
- If SVG needed: K-means 6-color →
vtracer --mode polygon → SVGO (conservative preset).
- Monochrome variant: greyscale → Otsu threshold → tint brand black.
- Validate: tight-bbox ≤ 80% safe zone, palette ΔE2000 ≤ 10, OCR matches wordmark if present.
Failure → action
- Checkerboard → route to
gpt-image-1 (different provider).
- Wordmark garbled → regenerate mark text-free, composite SVG type.
- Palette drift → Recraft
controls.colors or recolor post.
200 SVG paths → regenerate with "simpler geometry" or raise K-means color count.
Output
logo/
├── master.png # 1024² RGBA
├── mark.svg # vector
├── mark-mono.svg # monochrome
├── mark-inverse.png # dark-mode variant
└── meta.json # provenance + validations
1---2name: logo3description: Generate a production-grade logo (primary brand mark). Returns RGBA PNG master + SVG vector + monochrome variant. Route by text-length and per-model ceiling. Strong-text models render multi-word and even paragraph-length wordmarks reliably; weak-text models composite SVG type post-render.4---56# Logo generation78## Spec9- **Master:** 1024×1024 RGBA PNG, transparent background, subject centered in 80% safe zone10- **Vector:** SVG, ≤200 paths, fixed viewBox, SVGO optimized11- **Monochrome:** 1-color mono variant (auto-derived via luminance threshold or separate generation)12- **Wordmark routing — model-specific, not blanket:**13 - **Paragraph-length OK:** `gpt-image-2`, `gemini-3-pro-image-preview` (Nano Banana Pro), `gpt-image-1.5`. Include the wordmark in the prompt; composite stays safer for pixel-exact UI copy.14 - **3–10 words reliable:** `ideogram-3` / `ideogram-3-turbo`, `gemini-3.1-flash-image-preview` (Nano Banana 2), `gpt-image-1`, `flux-2` family.15 - **≤3 words / ≤25 chars:** Imagen 4 family, Recraft V4.16 - **Composite always:** Flux 1.x, Flux Schnell, SDXL, SD 1.5, Mystic, Pollinations, original Nano Banana 1.1718## Routing by intent19| text in mark? | vector needed? | primary | fallback |20|---|---|---|---|21| none | yes | Recraft V4 (native SVG) | `gpt-image-1.5` → BiRefNet → vtracer |22| none | no | `gpt-image-1.5` (`background:"transparent"`) | Ideogram 3 Turbo (dedicated `/v1/ideogram-v3/generate-transparent` endpoint, `rendering_speed:"TURBO"`) |23| 1–3 words | yes | Ideogram 3 → raster 1024 → BiRefNet → K-means(6) → vtracer → SVGO | Recraft V4 |24| 1–3 words | no | Ideogram 3 | `gpt-image-1.5` |25| 4–10 words | yes | `flux-2` / `gpt-image-2` → raster 1024 → BiRefNet → K-means(6) → vtracer → SVGO | Nano Banana Pro |26| 4–10 words | no | `flux-2` family or `gpt-image-2` (note: gpt-image-2 has no native RGBA — matte after) | Nano Banana Pro |27| paragraph | any | Nano Banana Pro or `gpt-image-2`; composite is still safer for pixel-exact UI copy | composite via `BrandBundle.typography` |2829## Dialect-ready prompt scaffold30```31A [flat vector | isometric | brutalist | soft gradient] logo mark representing [SUBJECT, concrete noun phrase].32Centered composition. Clean silhouette, strong tight outline, high contrast.33Palette: [#hex, #hex, #hex] strictly.34["WORDMARK TEXT" in sans-serif, tight tracking | text-free mark].35Solid pure white background. Square 1:1 aspect. 1024x1024.36```3738For SD: prepend `masterpiece, vector logo, flat design, minimalist, 8k, `.39For Flux: drop all quality modifiers; be concrete about subject and palette.4041## Post-process421. BiRefNet matte (or Recraft SVG → rasterize at 1024).432. Checkerboard-pattern probe: reject if failed.443. If SVG needed: K-means 6-color → `vtracer --mode polygon` → SVGO (conservative preset).454. Monochrome variant: greyscale → Otsu threshold → tint brand black.465. Validate: tight-bbox ≤ 80% safe zone, palette ΔE2000 ≤ 10, OCR matches wordmark if present.4748## Failure → action49- Checkerboard → route to `gpt-image-1` (different provider).50- Wordmark garbled → regenerate mark text-free, composite SVG type.51- Palette drift → Recraft `controls.colors` or recolor post.52- >200 SVG paths → regenerate with "simpler geometry" or raise K-means color count.5354## Output55```56logo/57├── master.png # 1024² RGBA58├── mark.svg # vector59├── mark-mono.svg # monochrome60├── mark-inverse.png # dark-mode variant61└── meta.json # provenance + validations62```
MohamedAbdallah-14