ポスター・デザインのプロンプト（Poster and Design Prompts）

Here are the prompts. You asked for the whole poster in one go, so the text is inside the image. AI tools sometimes garble lettering, so I kept the wording short, put every string in quotes, and left out the address (you didn't give one, and I won't invent it).

Prompt: A3 portrait

Vintage 1960s jazz club poster, vertical A3 portrait (aspect ratio 1:1.414, or the closest your tool offers). Warm retro screen-print style with visible paper grain, slightly worn ink texture and soft halftone shading. Limited palette: deep teal blue, burnt orange, mustard yellow, and cream paper, with a near-black for outlines.

Illustration: a stylised blue door in the center, slightly ajar and glowing with warm amber light. Silhouettes of a jazz trio (upright bass, piano, and drums or saxophone) are visible in the doorway. Musical notes and simple sunburst rays radiate outward.

Typography, spelled exactly as written, in bold retro display lettering with a clean sans-serif for the details:

• Top, largest: "JAZZ NIGHT"
• Directly beneath, medium: "at Blue Door Cafe"
• Lower area, medium: "Saturday 14 March · 7 pm"
• Bottom banner, smaller: "Live Trio · Free Entry"

Use these five lines of text only. Do not add any other words, URLs, addresses, logos or watermarks. Keep generous margins around all text, with high contrast between text and background. Centered, symmetrical layout with one clear focal point (the door) and a clear reading order from top to bottom.

Prompt: square (social media)

Vintage 1960s jazz club poster, square 1:1 format. Warm retro screen-print style with paper grain, worn ink texture and halftone shading. Palette: deep teal blue, burnt orange, mustard yellow, and cream, with near-black outlines.

Illustration: a glowing blue door slightly ajar, with a jazz trio in silhouette inside, and musical notes and sunburst rays around it. Keep the artwork compact so all text stays well inside the edges, because social platforms crop and overlay UI.

Typography, spelled exactly as written:

• Top, largest: "JAZZ NIGHT"
• Beneath: "at Blue Door Cafe"
• Lower area: "Saturday 14 March · 7 pm"
• Bottom banner: "Live Trio · Free Entry"

Use these four lines of text only. Do not add any other words, logos or watermarks. Centered layout, high contrast, one focal point.

Tips for getting a usable result

• Generate several versions (4–8) and pick the one with correct text. Check every letter, especially "Saturday", "Cafe" and the "7 pm".
• Generate the square separately. Don't crop the A3 version. The layout and text placement will differ.
• If one line keeps coming out wrong: keep the best image and fix only that line in an editor (Canva, Photoshop, Affinity). If your tool supports inpainting, you can regenerate just that area.
• If the text keeps failing: ask for the same artwork with "no text, no letters" and leave a calm area at the top and bottom. Then add the type yourself. That's the more reliable route, and I can write that prompt if you want it.

Print check for A3

• A3 is 297 × 420 mm, which is about 3508 × 4961 px at 300 dpi. Most AI tools output less, so you'll likely need to upscale.
• Ask your printer about bleed (usually 3 mm) and colour mode (usually CMYK). AI images are RGB, so colours, especially the teal, may shift slightly.
• Keep important text well away from the edges.

Do you want to add an address or a cafe logo? If so, I'd add them in an editor afterwards. Small text and logos are the parts AI most often gets wrong.