Edit an image

OpenAI-compatible image editing endpoint. Accepts EITHER ``multipart/form-data`` (binary uploads: ``image``, optional ``mask``, ``reference_images``) OR ``application/json`` whose image fields are data-URL / base64 strings (or ``{"url": ...}`` objects) — the same convention as the chat ``image_url``. Remote http(s) URLs are rejected (mesh does not server-side-fetch images); send a ``data:image/<fmt>;base64,<data>`` URL. Supports ``operation`` in {edit, remove_background, upscale, outpaint, mix, reframe, inpaint}. Each op is gated by the resolved model's supports_image_<op> flag (422 when unset / unsupported); the legacy provider matrix is a transitional backstop for the original four ops. - ``edit`` (default): openai, byteplus, vertex — prompt + image (+ optional mask + refs). - ``remove_background``: openai, vertex — image only; prompt optional. - ``upscale``: vertex (Imagen) or byteplus (Seedream Smart Upscale) — image + upscale_factor (x2|x4; Seedream maps x2→2k, x4→4k). - ``outpaint``: vertex — image + prompt + mask (defines expansion region). - ``mix``: Gemini image models + gpt-image (openai) — prompt + image + 1-3 reference_images (2-4 sources composed into one, sent as image[]); single output. - ``reframe``: Gemini image models — image + aspect_ratio (1:1|3:4|4:3|9:16|16:9|2:3|3:2); recomposes by outpainting to the target ratio; single output. - ``inpaint``: openai, vertex — image + mask (canonical WHITE=edit; mesh normalizes per provider). Optional mask_feather blends the result back through the mask (Pillow; 501 if unavailable). > **Note:** The image response may not render in GitBook's "Test it" panel. > To view the edited image, try this endpoint with Postman, curl, or another > HTTP client.