Medieval travel poster prompt: three colors only

Create a vertical mid-century travel poster for [CITY NAME] featuring [LANDMARK]. Use a strict 3-color palette: cream paper, black technical linework, and [COLOR].
Style: Minimalist isometric bird's-eye view with ultra-fine hatching and screen-print texture.
Color usage: Solid flat [COLOR] for the entire sky and small accents on roofs or streets. No gradients.
Text: Bold sans-serif "[CITY NAME]" at top in cream, with the local language name in smaller cream text below.

Travel-poster prompts tend to become adjective lists — vintage, premium, atmospheric — and every render disagrees. This one sets a single rule: the palette is capped at three colors, and the style grows out of that constraint.

• The three-color limit is the style. Cream paper, black linework, one accent — exactly the material conditions of mid-century print posters.
• “No gradients” blocks the biggest slide. One gradient and the sheet drifts into digital illustration.
• The type rule is concrete: bold sans-serif city name at top in cream, the local-language name in smaller type below.

Details worth keeping

• Swap [CITY NAME] and [COLOR] to run a series; muted brick red, forest green or Prussian blue all hold up.
• “Ultra-fine hatching” is what buys the linework texture; drop it and the sheet degrades into flat silhouettes.
• The original case was posted by @Goodmanprotocol on X; the prompt here is curated from the open-source repo freestylefly/awesome-gpt-image-2 (MIT license), and the example image is the case’s Porto render. Source material comes from the open community; rights holders can ask us to take it down at any time.
• For the handcrafted 3D take on the same brief, see the wool felt diorama prompt.