The blue lamp has become green. Unfortunately, the switch has moved, the shade is wider and the matt finish now looks glossy. An edit can satisfy the colour instruction while losing the product it was supposed to depict.
AI product recolouring needs a narrower brief than a new product illustration. GPT Image 2 and Nano Banana Pro both support image editing in their vendors’ documentation. Neither description is a guarantee that every unmentioned detail will remain unchanged.
Begin by deciding whether the request is a colour change or a material change. Turning a red painted surface blue is one assignment. Turning painted plastic into brushed metal introduces a different appearance, with different reflections and texture. Calling both “recolouring” hides the distinction that matters during review.
AI product recolouring starts with the finish
For a colour-only edit using GPT Image 2, describe the object and the precise area to change. Then identify the details that must survive: the silhouette, the switch position, seams, printed markings and the surrounding photograph.
Look at the source first. If the lamp’s edge disappears into a dark background or the switch is hidden by a reflection, choose a photograph that actually shows the details you expect the editor to preserve. A longer prompt won’t reveal an invisible boundary.
Provide a colour reference when the result needs to resemble an existing variant. Describe whether that reference supplies only the colour or also the material finish. A glossy sample should not silently change a matt object into a reflective one.
For the lamp, a starting instruction could read: “Change only the painted blue shade to the green shown in the colour reference. Keep its matt appearance. Preserve the shade shape, stem, switch and background.”
A catalogue image representing a real finish still needs approval against the product or an approved reference. The colour on a screen is insufficient proof.
Read the damage before rewriting the prompt
When an output looks wrong, name the kind of error. Different failures call for different repairs.
| What changed unexpectedly | What to inspect | A sensible next attempt |
| Colour spills onto the background | The object’s boundary | Use a clearer source or a supported local selection |
| A seam or switch moves | Product geometry | Reduce the requested change and compare the original closely |
| Matt paint looks polished | Material appearance | State that the original finish must remain |
| A label acquires new lettering | Printed detail | Preserve that region separately in the final edit |
| Shadows become a flat colour | Light and surface shading | Request a colour change that retains the source shading |
Check which editing controls your host actually exposes before choosing a repair.
First, save the failed image beside the source. Looking at them alternately can reveal changes that disappear when each is judged alone. Pay attention to distinctive details: a screw, the end of a handle or the opening around a cable.
Second, remove instructions that invite redesign. Phrases such as “make it premium” may be appropriate for a concept image, but they add ambiguity to a colour replacement. The desired colour should be the main change in the request.
Third, use an available mask or local-edit control only after confirming how that interface handles it. A mask may help define the intended region; it still needs review afterward. Don’t treat the presence of a selection box as proof that everything outside it is untouched.
Inspect a small preview for overall resemblance, then zoom in on edges and markings.
Compare both editors against the same original
Make a separate attempt with Nano Banana Pro, using the untouched source photograph and the same colour reference. Starting from the first model’s edited image risks carrying its mistakes into the second attempt.
Compare the results by the amount of repair needed. One version may have the more attractive green but the less faithful shape. Another may keep the hardware correct while leaving a small patch of the old colour. Your choice depends on which error can be corrected without misrepresenting the item.
For a sales listing, inspect the exact crop and export that will be published.
There is also a practical stopping point. If both versions repeatedly redraw a distinctive edge, a conventional masked colour adjustment may be easier to control. Keep the original photograph as the base and limit the replacement to the region you can verify. A fresh photograph of the real variant may be necessary when the finish itself changes.
Keep concept images separate from approved catalogue assets. A convincing recolour does not establish that the pictured variant exists, that it has been manufactured or that its finish looks that way in ordinary light. Label the working file accordingly until the product owner approves it.
Retain the original photograph and the approved colour reference for the next edit. With AI product recolouring, the green lamp should still have the same switch, seams and shade as the blue one. Check those details before approving the new colour.
