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The image backends call PIL Image.save(request.dst) without a format, so Pillow infers the encoder from the file extension. The core passes an absolute staging path ending in .tmp (e.g. /staging/localai-output-*.tmp), which Pillow can't map to a format, raising "unknown file extension: .tmp" and crashing the worker right after a successful GPU inference. Pass format="PNG" explicitly. LocalAI serves generated images as PNG regardless of the temporary path, so this is always correct and no longer depends on the extension of the destination the core happens to allocate. diffusers is the reported backend (#10727); vllm-omni and tinygrad carry the identical latent crash for any .tmp staging destination. Closes #10727 Assisted-by: Claude:claude-opus-4-8 [Claude Code] Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>