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Sketch to CAD-Style Line Art Conversion Prompt
A two-part prompt sequence for Nano Banana Pro (using its 'Thinking Mode') to convert a rough sketch into precise, CAD-like line art. The first prompt instructs the model to finalize the rough sketch, referencing blue text annotations, removing ambiguity, and applying line weight variation. The second prompt is a follow-up instruction to apply the same style to subsequent rough sketches.
Prompt
このラフ画を清書して線画を作って下さい。青い文字を読んで参考にし、手書きに伴う曖昧さや雑さは排除し、CADツールから出力したような精緻な線画にしてください。稜線は太くするなど、線の太さに強弱をつけてください。青い文字と線は削除し、出力画像には含めないでください
同じ調子でこのラフも清書してくださいImages
Prompt source
License
CC BY 4.0. Prompt pages keep the original attribution and source links from the upstream gallery records stored in the database.
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