One Shadow Recipe for an Entire Product Catalogue

A catalogue can contain individually good product photos and still look untidy as a set. One item casts a long shadow to the right, another has a tight grey pool underneath, and a third appears to float on white. Customers may not identify the cause, but the page no longer feels like one shoot.

Photoroom’s current batch-shadow controls offer a practical fix. Instead of choosing only Soft, Hard or Floating, sellers on supported plans can standardise intensity, softness, direction, spread and product orientation across a batch. The important part is not adding a prettier shadow. It is defining one repeatable lighting rule for a group of SKUs.

Start with a shadow brief, not the batch button

Decide what the catalogue should communicate before editing. A soft, short shadow suits many clean marketplace and Shopify packshots because it grounds the product without dominating the frame. A longer directional shadow can work for campaign images, but it is harder to keep believable across objects with different shapes.

Write the rule in plain language. For example: “Soft light from the upper left, short pale-grey shadow falling behind and right, product resting naturally on the surface.” This gives you something to compare against when a result looks attractive but inconsistent.

Keep marketplace requirements in mind. A shadow may be acceptable on a secondary image yet unsuitable for a platform’s main-image rules. Create separate export groups rather than assuming one treatment belongs everywhere.

Prepare the products before generating shadows

A shadow tool cannot repair inconsistent source photography. Align the products to a common canvas, use similar padding and remove unwanted backgrounds first. Correct exposure and white balance before the batch so the shadows are not being applied to one bright image and one muddy image.

Separate products by physical orientation. Photoroom’s controls distinguish Upright from Flat. Upright places the shadow at the product’s base, while Flat places it around the sides of an item photographed from above or at a low angle. A necklace laid on a surface should not share the same orientation setting as a standing perfume bottle.

Create a small test group containing the difficult shapes in your range. Include a tall item, a wide box, a flat object and a reflective or transparent product. For jewellery, include both a solid ring or cuff and a fine chain. If one recipe survives those examples, it is more likely to scale.

Lock the five controls

Photoroom’s Advanced or Custom shadow mode exposes five useful decisions. Intensity controls darkness. Softness controls edge definition. Direction chooses where the shadow falls around the object. Spread controls its length. Product orientation tells the system whether the item is upright or flat.

If catalogue consistency is the goal, avoid leaving all of those decisions on automatic. Photoroom’s API documentation says that setting all five override parameters makes the result deterministic, giving each SKU the same lighting setup. Leaving the values unset lets the model optimise each image individually, which may look good one by one but vary across the catalogue.

Choose the direction first because it implies the light source. Then set softness and intensity together. A very hard, dark shadow suggests a small, strong light. A soft, pale shadow suggests a larger diffused light. Spread should match that decision rather than being chosen only for decoration.

Save the values with a clear name such as “Catalogue white v1” or “Holiday warm-grey v1.” If you later revise the look, create v2 instead of silently changing the recipe. That gives the team a reproducible visual standard.

Run a pilot before the full catalogue

Apply the recipe to five to ten products and view them together on one page. A contact sheet reveals direction and density differences faster than opening files one at a time. Check the images at full resolution and at the small size customers will see in search results.

Look closely at the contact point. An upright object should appear to meet the surface at its real base. A flat product should not gain a dark rim that makes it look cut out. Fine jewellery chains need particular attention because a broad generated shadow can merge separate links or make the chain appear thicker.

Compare the generated shadow with highlights already present on the product. If a bottle has a bright highlight on its right edge, a strong cast shadow suggesting light from the right may create impossible lighting. In that case, change the batch direction or reshoot the source rather than forcing the shadow.

Approve the pilot only when all products look as if they share the same studio. Then apply the recipe to the larger batch and spot-check every product type, not only the first and last files.

Avoid double shadows

Do not add an AI shadow to a product that already sits in a fully generated scene. Photoroom explicitly advises against combining its Add Shadows API with an AI background because the background generator already creates a shadow. Applying another can produce two contact points or conflicting light directions.

The same principle applies to ordinary source photos. Remove or neutralise an old cast shadow before generating a new one. If the existing shadow contains useful detail around a transparent product, a manual edit may be safer than replacing it.

Photoroom also redraws AI shadows by default when an object layer moves. That can be helpful, but it means a late position change can produce a different shadow. Turn off automatic regeneration when an approved shadow must remain fixed, or include the moved image in a new review round.

Know the plan and export limits

Photoroom says Batch is available on all plans, but exporting batch images requires a paid subscription. Basic shadow presets do not use AI credits. The controllable batch settings are listed for Max and Ultra and do use AI credits.

The Web App’s Batch export is capped at 2048 by 2048 pixels, while Photoroom lists higher limits outside Batch and up to 6000 by 6000 pixels through its API. Check the required listing size before processing a catalogue. Enlarging a small source inside a larger canvas does not restore lost product detail.

If advanced controls or credits do not fit the job, a regular layer shadow remains an option. Photoroom notes that layer shadows offer more manual control over position, angle and colour, although they take longer to style. That can be worthwhile for a small hero set.

A simple acceptance checklist

Before publishing, confirm that the product itself is unchanged, every shadow falls in the agreed direction, contact points look plausible, transparent edges remain clean, and no old shadow is visible underneath. Review reflective products and fine chains at 100 percent.

The best batch workflow is not the one that produces the strongest effect. It is the one a seller can repeat next month for ten new SKUs without the additions looking like they came from a different studio. Define the light once, test it on the hardest products, and keep the recipe with the catalogue.

Sources

Photoroom Help Center, “Apply AI Shadows to a batch of images (Web App),” reviewed 6 October 2026: https://help.photoroom.com/en/articles/14170886-apply-ai-shadows-to-a-batch-of-images-web-app

Photoroom Help Center, “How to use AI Shadows,” reviewed 6 October 2026: https://help.photoroom.com/en/articles/15922375-how-to-use-ai-shadows

Photoroom, “Add Shadows API,” reviewed 6 October 2026: https://www.photoroom.com/api/add-shadow

Photoroom Help Center, “Turn auto-redrawing of AI Shadows on or off,” reviewed 6 October 2026: https://help.photoroom.com/en/articles/13045461-turn-auto-redrawing-of-ai-shadows-on-or-off-web-app

Photoroom Help Center, “Image resolution limits for exports,” reviewed 6 October 2026: https://help.photoroom.com/en/articles/4566301-image-resolution-limits-for-exports