AI-generated posters don’t have to be horrible
https://john.hartnup.uk/2026/06/07/ai-event-posters.html📌 千篇一律的AI海報,其實是輸給了提示詞的懶惰
TL;DR:同一個社區活動海報,只要換一種風格提示詞,ChatGPT就能跳出「AI感」樣板。
社群媒體上流傳一張拼貼圖,收集了一堆風格幾乎一模一樣的 AI 生成活動海報:粉彩色調、手繪風花朵、彩帶邊框。問題不在於這些海報難看,而在於同一種風格看了二十次之後,開始讓人厭煩。部落格作者 john.hartnup.uk 決定證明,這個問題其實出在提示詞,而不是模型本身。
🤔 「請畫一張春季園遊會海報」得到的,還是那套老樣板
作者先給了 ChatGPT 一份虛構的活動細節(日期、地點、攤位內容),並特別要求「乾淨俐落、避免粉彩水彩風格、避免出現人物」。結果第一次產出的海報,依然帶著那種熟悉的、想要避開的「工藝園遊會」既視感。
🧩 要求一個完全不同的設計美學,答案立刻不一樣
作者接著要求 ChatGPT「用完全不同的設計美學重做一張,把前一張當作『不要這樣做』的參考」,這次得到的是 Bauhaus/幾何現代主義風格:粗體無襯線字體、對稱佈局、高對比配色。作者追問這是什麼風格,ChatGPT 給出了具體的名稱與特徵說明(Bauhaus、Swiss Style、Geometric Minimalism 等),並反問是否要推得更極端,例如 brutalist、riso 印刷、90 年代 rave 傳單、日式極簡等。
作者接著請 ChatGPT 直接列出一份風格選單,涵蓋從「乾淨但有個性」(Bauhaus、Swiss Style、雜誌編輯風)、「圖像化但不甜膩」(Risograph、Matisse 剪紙拼貼、現代化植物科學繪圖),到「大膽另類」(Brutalist、90 年代 Rave 螢光、Memphis 後現代主義)等多個方向,並附上針對這次園遊會需求的推薦清單。此後作者依序生成了 Stamp/Letterpress 風格、日式極簡風格、Memphis 風格,甚至致敬知名唱片封面設計工作室 Designers Republic 的版本,以及「專業排版師幫小孩水彩畫加字」和「80 年代龐克地下刊物影印風」等實驗性風格。
💡 對話上下文會悄悄「污染」後續生成結果
作者觀察到一個值得留意的細節:在生成 Designers Republic 風格版本時,ChatGPT 自行加上了一行文案「A day of music making and family fun」。因為這段文字已經留在對話上下文中,後續生成的海報也跟著沿用了這句話。作者提醒,如果從頭就明確指定想要的風格,就能避免這種「一路累積不必要元素」的狀況。
⚠️ 仍然帶著一點AI味,但至少不再千篇一律
作者坦言,這些海報依然帶著「AI 感」,但這本來就不是他的目標。重點不是隱藏 AI 的使用痕跡,而是避開那種讓所有人看膩的單一樣板長相。
🎯 實務啟示:把設計語彙當成提示詞的一部分
這篇實驗對工程師的啟發是,圖像生成模型的「風格詞彙量」遠比多數人日常使用的範圍更廣。與其接受模型的預設輸出,不如像作者一樣,主動要求模型列出具體的設計流派名稱(Bauhaus、Swiss Style、Risograph 等),再針對名稱疊代生成。同時要留意多輪對話中不小心「沾染」到上下文的內容,必要時開新對話重新指定風格,避免非預期元素累積。
🔗 來源
- 標題:AI-generated posters don’t have to be horrible
- 作者/機構:john.hartnup.uk(ereiamjh)
- 連結:https://john.hartnup.uk/2026/06/07/ai-event-posters.html
#AIArt #PromptEngineering #GenerativeAI #ChatGPT #GraphicDesign #ImageGeneration #DesignSystems #CreativeAI #PosterDesign #AIWorkflow
原始資料 Hacker News · 收集於 2026-09-19
摘要原文
The problem A now famous Facebook post shows us the scourge of identikit posters generated by AI. Here’s an article on the subject from the Independent . A collage of AI-generated village fayre posters found online Here’s another I found in the wild. With apologies for picking on the Leamington Beer Festival - they are by no means unique Leamington Beer Festival 2026 — with commentary from a passer-by The problem with these is not so much that they’re bad. They’re OK , I don’t love them. The problem is that once you’ve seen that style 20 times it starts to irritate just from the sheer repetition. I knew that even ChatGPT was capable of a broader variety of styles than this, so I set out to prove it. I gave ChatGPT some invented event details and asked it to produce a poster. Rather than go with the default look it would choose for a spring fayre, I made a point of specifying what I thought was a different style: Me: Produce a poster for a spring fayre. 21 April - 11am to 3pm Mill Beach Park, Honeyford Free entry Tombola Cakes and drinks Performance by a samba band and a dhol band. Craft stalls Circus Skills workshop Go for a clean, unfussy, bright layout with a bold striking spring-themed graphic. Avoid pastel/airbrush/oil style art or images of people. This is what came back. First attempt — the default craft-fayre template Not as successful as I hoped. To me it still feels like what I’m trying to avoid. I asked for something deliberately different. Me: Make another one using a completely different design aesthetic of your choice. Treat the current one as a “what not to do” – not that there is anything wrong with it, but we want ours to stand out from other posters that look similar. Second attempt — Bauhaus / geometric modernist I think this is already much better. It stands out just be being different. I wondered what I would call this style if I wanted to ask for it again? Me: What is this design style you’ve used called? ChatGPT: This one is leaning into a modernist / Bauhaus-influenced graphic style, with a bit of contemporary “flat illustration” layered on top. More specifically, you could describe it as: Bauhaus / Modernist Poster Design Rooted in the Bauhaus tradition (1920s–30s) Strong emphasis on function over decoration Asymmetrical layout with clear hierarchy Bold, simple sans-serif typography Limited, high-contrast colour palette Geometric Minimalism Built from basic shapes (circles, semicircles, rectangles) The flower is abstracted into almost symbolic forms Very little texture or shading — mostly flat colour Swiss Style (International Typographic Style) influence Clean grid-based alignment (even if loosely applied) Information-first layout Clear, legible structure If you wanted a shorthand label for a designer or printer, you could call it: “Bauhaus-inspired geometric minimalist poster” If you’re trying to stand out, this direction works well because most local event posters default to: bunting hand-drawn florals pastel palettes “craft fair” aesthetics Whereas this feels more like: a gallery poster a design museum flyer or something you’d see in a well-curated café If you want, I can push it further into a really distinctive niche (e.g. brutalist, risograph, 90s rave flyer, Japanese minimal, etc.). Well, thanks GPT. I knew there was an endless array of design styles that it could produce. Instead of trying to dredge some names from my memory, I asked for suggestions. It replied with a list of styles, some of which I’d never heard of, some I recognised but couldn’t picture, some which were names I didn’t know for styles I did. Me: Give me a list of styles to choose from ChatGPT: Here’s a deliberately varied menu—some safe-but-distinct, some quite left-field. I’ve kept each one concrete so you can imagine how your fayre poster would actually look. 🎨 Clean but Characterful 1. Bauhaus / Modernist (What you just saw) Geometric shapes, primary colours, strong type Feels cultural / design-led rather than “craft fair” 2. Swiss Style strict grid, lots of whitespace Black/white + one accent colour Very “information design”, almost institutional 3. Contemporary Editorial (Magazine-style) Big headline, elegant serif + sans mix Think weekend supplement or gallery leaflet Could feel surprisingly premium for a fayre 🌿 Graphic & Illustrative (but not twee) 4. Risograph Print Style Limited ink colours, slightly misregistered layers Grainy textures, bold shapes Feels handmade but designed, not crafty 5. Cut Paper / Collage (Matisse-inspired) Inspired by Henri Matisse cut-outs Organic shapes, bold colour blocks Very striking from a distance 6. Botanical Scientific Illustration (Modernised) Clean line drawings of plants, labelled or diagram-like Monochrome + one highlight colour Quietly distinctive, slightly academic ⚡ Bold / Unusual Directions 7. Brutalist Graphic Design Raw, high-contrast, almost “ugly on purpose” Heavy black blocks, stark type Feels rebellious—very different from typical village posters 8. 90s Rave Flyer / Acid Graphics Neon colours, warped type, energetic layout Could echo the samba/dhol energy Surprisingly effective if done with restraint 9. Memphis Design (80s Postmodern) Playful shapes, squiggles, clashing colours Inspired by Memphis Group Fun but still graphic and bold 🧭 Quietly Distinct / Understated 10. Japanese Minimal Poster Very restrained layout, lots of empty space One strong graphic element Elegant, calm, and unusual in this context 11. Monochrome + Single Accent (Ultra-minimal) Black, white, and e.g. bright green or orange Typography-led, almost no illustration Relies on composition rather than decoration 12. Wayfinding / Signage Style Looks like a park map or transport signage Icons, arrows, structured layout Functional but visually interesting 🎪 Slightly Playful but Still Clean 13. Modern Icon System Everything represented as simple icons Consistent stroke weight, grid-based Feels like an app UI or transport system 14. Stamp / Letterpress Style (Modernised) Bold inked shapes, slight imperfections Limited palette, strong contrast Suggests “event” without being twee 15. Festival Poster (Contemporary Indie) Big central graphic + stacked lineup text Borrow cues from music festivals Works nicely given the bands If you want a steer Given your brief (“clean, unfussy, bold, no twee imagery”), the strongest stand-out options are: Risograph Cut paper / Matisse Brutalist (toned down slightly) Japanese minimal Wayfinding / signage If one of these clicks, I can generate a poster in that exact style—and push it properly, not just superficially. Asking for specific aesthetics produced a variety of posters. Now, I’m not claiming these don’t have a whiff of AI about them. I don’t think that’s really my goal - we can be honest that we’re using AI, we just don’t want it to have that look that everyone’s sick of. Me: Please give me Stamp / Letterpress Style (Modernised) Stamp / letterpress style Me: and now please Japanese Minimal Poster Japanese minimal Me: Now do Memphis Design please (I didn’t know what Memphis Group design was, but I recognised if when I saw it. Memphis design Then I got a bit silly. Designers Republic is a design agency famous for record covers from the late 80s onwards. Me: And now in the style of Designers Republic Designers Republic inspired One note here is that along the way, the poster has acquired extra text (“A day of music making and family fun”) – it’s decided that Designers Republic would have thrown in some text of that kind, so it’s come up with some words. Those words are now in the chat context, so they appear in subsequent posters. If you were working from scratch, you’d just ask for the style you want in the first place, and avoid picking up trappings as you go. Me: Now as if a professional graphic designer has added typography to a poster paint drawing by his young child. Child's poster paint + professional typography Me: Now with the aesthetic of a photocopied 1980 punk fanzine. (1006 points, 580 comments on Hacker News)
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