背景追加ツール

プリセット背景の他、お持ちの画像をカスタム背景として使用できます。

AI技術により、自然なエッジ処理で違和感のない合成が可能です。

はい、複数の要素を重ねて、複雑な合成画像も作成できます。

Yes, and that's actually the highest-value workflow for brand teams running headshot grids, About-page galleries, or product-launch ad sets. The custom-upload slot caches the backdrop you uploaded for the duration of the editor session, so you can drop subject one, composite against the brand backdrop, export, then drop subject two and composite against the same backdrop without re-uploading. For longer-term reuse across sessions, the brand-kit feature in the editor (saved templates) persists the backdrop in your browser's IndexedDB so it's available next time without a re-upload — useful for an agency processing 30 team headshots over a week, or a brand running a quarterly product-launch shoot. The backdrop never transits the network: it sits in your browser tab and gets composited client-side. For brand-kit deliverables specifically — handing the cutout back to a client agency or web developer — the better workflow is often to export the cutout as a transparent PNG via `/transparent-background/` and let the downstream tool handle the backdrop, since the destination context (web hero, print spec, video frame) often dictates a backdrop choice that's outside this tool's preview.

Three different intents, three different pages. `Add a background` (this page) replaces the original backdrop with a new one: a solid colour, a gradient, a ready background image, or your own upload. The original backdrop is discarded entirely; only the subject cutout carries forward into the composite. `Blur the background` (`/blur-background/`) keeps the original backdrop visible but softens it. That is useful for portrait photography where the environment provides context (`subject is at a coffee shop` or `subject is outdoors`) but you want the subject to read clearly without competing detail. The original backdrop's colour temperature, lighting, and rough composition all carry forward; only the focus changes. `Remove the background` (`/transparent-background/`) discards the backdrop entirely and gives you the cutout on transparency. The asset is then placed onto whatever backdrop the destination (a design file, a website hero, a brand-kit deliverable) decides. The decision tree: if you want a different scene, use this page; if you want the same scene but softer, use `/blur-background/`; if you want no scene at all so the destination decides, use `/transparent-background/`. The white-only case (`/white-background/`) is a fourth page, for the marketplace-mandated pure-white backdrop. The colour-only case (`/change-background-color/`) is a fifth, for when you already know the exact colour you want. All five start from the same automatic cutout.