Verified against Nano Banana / Gemini 3.1 Flash Image · 2026-07-23
Get a pure-white marketplace background that actually meets Amazon's spec
Strips and replaces a product photo's background with an exact RGB(255,255,255) white that satisfies marketplace main-image requirements, while keeping the product itself untouched — built for sellers whose current photo has an off-white or shadowed background that keeps getting flagged.
The prompt
Ready to copy — highlighted parts are example details you can swap.
You are preparing a product photo to meet a marketplace's main-image requirements — specifically, a pure white background at RGB(255,255,255), with the product itself completely unedited. CURRENT PHOTO a stainless-steel insulated water bottle with a matte navy powder-coated finish, currently photographed with a slightly warm off-white background with a visible soft shadow gradient in the bottom-left corner. BACKGROUND REPLACEMENT Replace the entire background with a flat, pure white at exactly RGB(255,255,255) — not an off-white, not a light grey, not a white with a subtle gradient or vignette. The white must extend fully to all four edges of the frame with no visible seam, corner shadow, or color cast anywhere in the background. PRODUCT — DO NOT ALTER The product itself must remain completely unedited: same color, same proportions, same surface detail, same angle. This is a background swap, not a re-shoot — if the product's true color reads slightly warm or cool against its original background, preserve that same color reading against the new white background rather than color-correcting the product to look different than it actually is. SHADOW TREATMENT remove any ground shadow entirely — the marketplace this is headed to flags visible shadows on main images. Marketplace main-image specs typically require the product to be the only object in frame with no reflections, props, or shadows other than what's specified here — if in doubt, render the more conservative option (no shadow at all) rather than a shadow style that risks reading as a second object in the frame. CROPPING AND FILL crop so the bottle fills about 90% of the frame height, centered with even margin left and right. The product should fill a substantial majority of the frame — most marketplace specs expect the product to occupy roughly 85% or more of the image's longest dimension — with even margin on all sides rather than being pushed to one edge. EDGE QUALITY Pay particular attention to the product's actual edge against the new white background — no leftover halo, no soft blur line, no color fringing where the original background used to be. The transition from product to white should look like the product was always photographed against a true white sweep, not composited afterward. OUTPUT One image: product unchanged, background pure white RGB(255,255,255) edge to edge, ready to pass a marketplace's automated main-image background check without a second retouching pass.
Customize
Optional — swap in your own details for the highlighted parts above.
Why this works
Marketplace listing specs like Amazon's main-image requirement are unusually literal — they define compliant white as an exact RGB(255,255,255) value, not a subjective "looks white enough" judgment, and a background that a human eye reads as basically white can still fail an automated background check if it's actually a very light grey or carries a faint warm cast from the original shoot's lighting. Stating the exact RGB value in the prompt, rather than the word "white" alone, matters for the same reason pasting a hex code works better than a color-name adjective elsewhere in image prompting: Nano Banana reads the specific numeric value as a literal target rather than a loose stylistic suggestion, which measurably tightens how close the rendered background lands to true white compared to leaving the model to interpret "white background" on its own judgment. Second, the explicit instruction not to color-correct the product itself addresses a subtle but real risk in background-swap edits: a model replacing a background sometimes normalizes the whole image's color balance as part of the same pass, which can shift how the product's actual color reads — a navy product that looked slightly warm-toned under its original lighting might come out looking like a different, cooler navy against a suddenly neutral white background, which is a problem specifically because marketplace policies also penalize listings where the photographed color doesn't match the delivered product, so an edit that "fixes" the background but subtly changes the product's apparent color trades one compliance risk for another. Third, naming the specific edge-quality failure mode — a soft halo or color fringing where the old background used to be — matters because that exact artifact is the most common tell that a background was swapped rather than shot fresh, and it's precisely the kind of defect a marketplace's automated image-quality check, or a manual reviewer glancing at a listing, is trained to catch; describing it explicitly gives the model a concrete failure to actively avoid rather than leaving "clean edges" as an unstated assumption.
Verified against
Nano Banana / Gemini 3.1 Flash Image Gemini 3.1 Flash Image · 2026-07-23
Changelog
- 2026-07-23 — Initial publish, verified against Nano Banana (Gemini 3.1 Flash Image) on an off-white-to-pure-white background swap.
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