Edit reference photos and guide layout with FLUX.3 Klein

FLUX.3 Image Klein uses the same model family for text-to-image and image editing. Load a source photo and an instruction into ComfyUI’s Image Edit template to create a new image reflecting the request. For a product photo, decide whether to change only the color or also the background and lighting, then identify details such as the logo and product outline that must remain. ComfyUI Image Edit guide

In ComfyUI, open the Flux.3 Image Klein Distilled: Image Edit template and load the photo with LoadImage. Connect it to Set Reference Multi Latent, then describe the desired scene in the positive prompt¹. For example: “a product photo that keeps the green glass bottle and its position on the table, while changing the background to a bright stone kitchen in morning light.” Name both what should stay and what should change.

The template resizes reference images to about one megapixel. Keeping a larger source may preserve more detail for editing, but can also use more memory. ComfyUI reference image guide

FLUX.3 Klein accepts up to 10 reference images. Connect them in order to Set Reference Multi Latent in ComfyUI, then refer to each by index in the prompt, such as <ref_image_0> and <ref_image_1>. For example, ask it to use the first photo for the product shape and the second for the background colors.

Reference images guide the product shape and background. A logo or product outline may still change, so compare the saved result with the original. BFL model card

To place several elements, define regions with the template’s Create Bounding Boxes node and inspect them in Preview Any. The model-card format is [top, left, bottom, right] on a 0–1000 scale. For example, [100, 100, 300, 500] marks the top 10–30% and left 10–50% of the canvas. Boxes guide position and scale; they do not constrain pixels to a hard mask, so an element or nearby content may change outside the region. BFL bounding-box guide

Save the output PNG with SaveImage, then place it beside the original at the same size. Compare the product outline, logo, shadows, and background. If you intended to change just one element, inspect the areas that should remain untouched. Small text may be distorted, so add poster titles or product labels in a design tool and proofread them. Change one condition, such as the background or lighting, at a time to see how the output responds.