This prompt turns a plain photo of your product into a clean packshot on a pure white background, the standard that the marketplaces require and the one that stops a listing from being taken down. It works in NanoBanana, in Gemini and in ChatGPT.
1) Send the photo of your product along with the JSON prompt in the same message.
2) The AI preserves the product and puts it back on a pure white background, with softbox lighting and a soft contact shadow.
3) Adjust the background in "background" if you would rather have a light grey than absolute white.
4) Control the shadow and the reflections in the "lighting" block to make the finish more catalogue-like.
5) Keep "preserve_product" and "preserve_colors" so the AI changes neither the shape nor the colour.
6) Generate a few versions and pick the one with the crispest edges.
Tip: generate a square version too, because several marketplaces crop the main image into a square.
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