What are geometry-locked colorways?
Geometry-locked colorways are product photo variants where the physical geometry of the shot stays fixed — folds, creases, shadows, silhouette, camera angle — while only the color or material changes. In Retouch Less Variants, that is not a magic mesh: it is a two-image edit (master + swatch), a forced master aspect ratio, and numerical structure checks that flag when the model drifted.
The problem they solve
Catalog teams do not fail because they lack ideas. They fail because every new colorway used to mean another studio day — or a retouch queue that rebuilds the product from scratch.
Buyers notice when two colorways look like two different products. A sand curtain and a sage curtain should share the same fold language. Geometry lock is the discipline that makes that true.
What “locked” actually means in Variants
Retouch Less Variants runs a two-image job:
- Image 1 — the master photograph (geometry truth).
- Image 2 — the swatch (material / color truth).
The model is instructed to reproduce the master and wrap the swatch’s hue and micro-texture onto the existing folds, seams, and panels at real scale. Framing, background, props, drape, light direction, highlights, shadows, sharpness, and grain stay put.
The target look is simple: a second frame from the same session — not a CGI restyle. That is how you generate geometry-locked product colorways at ecommerce scale.
Preserve vs change (the craft split)
Preserve:
• Framing, background, props
• Geometry, drape, folds, creases, edge silhouette
• Light direction, highlights, shadows
• Sharpness, grain, photographic finish
Change:
• Color / material / finish from the swatch
• Weave or micro-texture wrapped onto the folds that already exist
Vertical craft notes (curtains vs apparel vs hardgoods) stay in the engine. Operators see a short intent — not a wall of forbid-lists. Naming a defect to forbid it often makes generative editors touch it. Affirmative preserve beats long negative lists.
Why aspect ratio and upload size matter
Two failure modes showed up in production:
- If the model follows the swatch’s orientation instead of the master’s, the product “turns.” Variants forces the master’s nearest supported aspect ratio so the plate does not recompose.
- Very large uploads can destabilize weave scale on textured textiles (bouclé was the lesson). Masters are capped at a max edge that keeps micro-texture coherent; output size is still chosen by intent (web ~2K vs print ~4K).
Geometry lock is as much about these constraints as about the prompt.
How we know it stayed locked
After render, Retouch Less runs local structure checks — CPU, no model judging a model by default:
- Edge / silhouette alignment vs the master
- Border / background drift (scene recomposed)
- High-frequency ratio (weave too coarse or smoothed away)
- Periodic pattern rhythm (stripes, repeats)
- Line deltas (seams, pleats added or lost)
- Color distance to the swatch (ΔE00, textile-weighted)
Absolute floors catch hard failures. A relative layer can compare siblings from the same master when enough pairs exist. Optional Flash review exists for edge cases — off by default.
If a metric cannot run (too few siblings), we skip it honestly. Silence is not “all clear.”
What geometry lock is not
It does not invent a new camera angle, a new prop set, or a new model pose. Those still need a shoot.
It does not guarantee “100% texture fidelity” as a slogan. Weave can fail; QC is there to flag it. Greys can drift mid-chroma without a measured clause — which is why swatch Lab can be injected when needed.
Use it for colorways and finish swaps. That is the high-ROI zone.
Produced by Fokalabs · Grenoble · Silicon Valley · Shoot less. Ship more.