Product scene compositor: FLUX.1 schnell backgrounds, unchanged product pixels

Generate the world, not the product

Most “product background” workflows hand the whole image to the model. Packaging text, logos and color codes drift. This workflow splits the job: the model only generates the backdrop; product pixels come from your transparent PNG and are composited with a mask.

Packaging text cannot drift, and the model cannot repaint the product color.

Output

One job produces three 1024×1024 scenes with the same product position and contact shadow. The prompt describes the environment only, such as “warm wood table, window light from the left, shallow depth of field”. Do not describe the product itself.

Pipeline

1. 1Load the transparent product PNG and center it on 1024 square
2. 2FLUX.1-schnell generates three backdrops in 4 steps
3. 3Derive the contact shadow from alpha
4. 4Composite the shadow, then the product
5. 5Save three scenes

Limits

No product relighting or color matching. If the source product has hard side light and the prompt asks for soft window light, the composite will look pasted. The tutorial covers matching light direction and when to use the relight workflow.