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Image GenerationZenn AI/MLPublished: Nov 7, 2026, 06:00 JST

Split prompts into four layers to keep AI image text intact

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Split prompts into four layers to keep AI image text intact

3 Key Points

  1. What happened

    A Zenn article lays out a four-layer prompt template — subject, shooting conditions, typography, usage constraints — and shows a mug prompt printing the exact word "MORNING" in bold sans-serif.

  2. Why it matters

    Because AI models can render light and texture but often garble letters, specifying the exact string and legibility, rather than asking for a nice-looking font, is what keeps ad creatives readable enough to be accepted.

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Context & Analysis

A practical frustration is the starting point: AI models reproduce light and texture well, but on-image text tends to come out looking like letters without actually spelling what you asked for. It attributes this to text being discrete — a single wrong character changes the meaning — and to the need to control position and spelling simultaneously. The fix it proposes is structural rather than tool-specific: separate the prompt into subject, shooting conditions, typography, and usage constraints so each concern is stated on its own.

Japanese and Korean have different character density from Latin letters, so writers should put the intended wording directly in the prompt, keep it short, and state the contrast between text and background. It pairs "exact text" with "fully legible / no misspellings" to narrow the room for the model to fall back on letter-like shapes. It also recommends fixing aspect ratio and margins up front, since layout shifts when the ratio is left open.

For corrections, multi-turn editing in a fixed order is favored — subject first, then text, then background and color — with one change per instruction. It points readers to GPT Image 2 as a browser-based environment for testing the same workflow, and stresses that visual inspection, especially zooming in on CJK characters, remains the final check.

FAQ
Why does AI image generation struggle with text?
Text is discrete, so one wrong character changes the meaning, and the model must handle layout and spelling at the same time. It also notes character density differs between Latin and Japanese or Korean scripts.
How should I specify aspect ratio and margins?
Fix the ratio before generating: 1:1 for e-commerce thumbnails, 9:16 for stories, 16:9 for banners, and 3:4 or 2:3 for posters. It also suggests adding phrases like "leave 10% margin" or "safe area for text".
What is the recommended order for fixing an image?
Generate the subject and composition first, then change the label text exactly, then adjust background and color. It says each instruction should change only one thing to avoid drifting parts that already look right.
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