# GPT Image Hub prompt

## Moteur de Prompts Blackglass Ascendant
- URL: https://www.gptimagehub.com/fr/library/blackglass-ascendant-architectural-prompt-engine
- Generator URL: https://www.gptimagehub.com/fr/generate?promptId=oss-ym-mm-32101
- Markdown URL: https://www.gptimagehub.com/api/agent/markdown?path=%2Ffr%2Flibrary%2Fblackglass-ascendant-architectural-prompt-engine
- Category: Concept art
- Model: nanobananapro
- Aspect ratio: 16:9
- Style: illustration
- Tags: prompt-systeme, dark-fantasy, concept-art, science-fiction, monochrome, clair-obscur, prompt-json
- Updated: 2026-10-26T21:53:18.098Z
- Created: 2026-10-26T21:53:18.098Z

Méta-prompt produisant des prompts JSON structurés pour de la science-fiction sombre à fort contraste. Modifiez le sujet, les matériaux et les accents entre crochets.

### Full prompt
```text
System Prompt: Blackglass Ascendant

Rewrite the input concept into a structured prompt for [Nano Banana Pro].

Core Framework:
1. Ascendant Frame: Establish one dominant subject [monolithic armored titan] commanding scale and silhouette via low-angle perspective, framed against an expansive open field.
2. Blackglass Lattice: Construct dark mass using segmented [glossy obsidian plates, matte carbon fabric, exposed hydraulic cables, and chiseled dark stone]. Differentiate surfaces: narrow reflections on gloss, light absorption on matte fabric, structural seams on leather, and joint thickness on metal.
3. Silverfall Halo: Position a single hard pale light source [harsh lunar rim light] behind the subject to trace exterior contours, reflective planes, and atmospheric depth without global bloom.

Lighting and Palette:
- Five-value tonal range from deep obsidian black to crisp white edge highlights.
- Source-facing contour illumination only; avoid flat black fills, full glowing outlines, and blown-out highlights.
- Near-monochrome palette with [a restrained crimson accent].
- Directed atmospheric particles [subtle rising ash drifted by horizontal wind].

Output Format (JSON):
{
  "aspect_ratio": "[16:9]",
  "scene": "[desolate basalt plateau beneath a pale eclipse]",
  "subjects": "[colossal biomechanical sentinel kneeling in stasis]",
  "ascendant_frame": "[low-angle wide view emphasizing towering scale and dominant mass]",
  "blackglass_lattice": "[faceted glossy plates layered over matte synthetic muscle and jointed alloy skeleton]",
  "silverfall_halo": "[pale sharp crest lighting etching shoulders, edges, and head crest]",
  "transitions": "[hard rim light falling off rapidly into deep shadowed recesses]",
  "composition": "[central monumental placement surrounded by vast negative open space]",
  "surface_and_palette": "[monochrome charcoal, deep obsidian, polished glass, sharp white rim, restrained crimson energy lines]",
  "avoid": "[global bloom, full chrome glow, cluttered background, flat lighting, oversaturation]"
}
```