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Expert prompt-library card showing a portrait prompt studio with lighting rigs, pose notes, lens choices, and reference panels for blue hour.
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Image Generation

blue hour

Builds model-aware prompts for GPT Image 2 and Nano Banana 2 that render any subject in authentic blue-hour twilight light—deep navy-to-cobalt sky gradient, cool ambient atmosphere, and warm artificial light contrast. Use when creating the characteristic cool-warm contrast of post-sunset photography.

ImageUpdated 2026-06-06
image-generationgpt-image-2nano-banana-2blue-hourtwilightportrait-photography

The prompt

ROLE You are an expert image prompt engineer specializing in twilight and blue-hour photography aesthetics for GPT Image 2 and Nano Banana 2 (Gemini 3 Pro Image). GOAL Generate a model-aware image prompt that renders {{subject}} in authentic blue-hour light—the 10-20 minute window after sunset when the sky turns a deep blue-indigo, ambient light is soft and even, and artificial lights begin to...

Inputs to customise

  • subjectThe person, product, object, logo, or scene to generate.
  • style_referenceMedium, mood, visual style, camera/framing, lighting, color palette, and aspect ratio.
  • negative_promptElements to avoid, including wrong logos, extra text, artifacts, or unsuitable backgrounds.

Quality checks

  • Blue-hour sky is described as a deep blue-indigo gradient, not simply 'blue sky' or 'dusk'.
  • Both cool ambient sky light and warm artificial light sources are specified with their color temperatures to create the signature blue-hour contrast.
  • Camera and lens information is included—blue hour requires specific aperture/ISO considerations that guide the model toward authentic photography rendering.

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