Vendored third-party files (for the “Cut out background” tool in /imagetools/)

Vendored third-party files (for the “Cut out background” tool in /imagetools/)

Pinned, locally-served copies, downloaded rather than hotlinked. The cutout engine itself makes no network requests beyond this origin: the model, the runtime and its WebAssembly all come from this directory, and the photo is never sent anywhere. The page around it loads fonts and the chat widget from CDNs like any page on this site, so the claim scoped to the engine is the one that is true. This directory is assets/js/segmentlib/ deliberately, not assets/js/vendor/, because assets/js/vendor is in the Jekyll exclude: list and would 404 on the built site.

What is here

filebyteswhat it is
cutout-encoder.v1.onnx14,254,548MobileSAM image encoder, ONNX, float16 weights
cutout-decoder.v1.onnx16,496,559MobileSAM mask decoder (4-mask head), ONNX, float32
cutout-expected.v1.json4,91864 expected decoder logits for the load-time “model verified” check
ort.wasm.min.js50,139onnxruntime-web 1.27.0, wasm-execution-provider build
ort-wasm-simd-threaded.mjs.js24,180its Emscripten glue module (loaded by the line above)
ort-wasm-simd-threaded.wasm13,479,978its WebAssembly runtime (SIMD, run single-threaded)

Model filenames are versioned (.v1.) and are deliberately NOT cache-busted with a ?v= query: the filename is the cache key, so a browser that already has the 30 MB of weights never re-downloads them on a site deploy. Only the JavaScript keeps ?v=.

The WebGPU-capable onnxruntime bundle was measured and NOT shipped: swapping ort.wasm.min.js + ort-wasm-simd-threaded.* for ort.min.js + ort-wasm-simd-threaded.jsep.* adds 13.05 MB of raw bytes, over the 10 MB budget this feature was allowed for optional acceleration. The tool runs on the wasm execution provider only.

Provenance

MobileSAM weights: Chaoning Zhang et al., https://github.com/ChaoningZhang/MobileSAM, Apache License 2.0 (verified via GET https://api.github.com/repos/ChaoningZhang/MobileSAM/license returning spdx_id: Apache-2.0). Original weights: https://huggingface.co/dhkim2810/MobileSAM.

ONNX export: Acly, https://huggingface.co/Acly/MobileSAM, declared MIT in the repository’s own metadata (license: mit in the README front matter, confirmed via the Hugging Face model API). That repository ships no LICENSE file and states no copyright holder, so the canonical MIT text is reproduced below with the holder left as the repository author. Files taken: mobile_sam_image_encoder.onnx -> converted to float16 (onnxconverter_common.float16, keep_io_types=True) and shipped as cutout-encoder.v1.onnx; sam_mask_decoder_multi.onnx -> shipped unmodified as cutout-decoder.v1.onnx. Per Acly’s README the encoder was exported with export_image_enoder.py from that repository and the decoders with export_models.py from the MobileSAM repository.

onnxruntime-web 1.27.0: Microsoft, https://github.com/microsoft/onnxruntime, MIT. Taken from the npm package onnxruntime-web@1.27.0 (dist/), byte-identical. The only change is a filename: upstream’s ort-wasm-simd-threaded.mjs is stored here as ort-wasm-simd-threaded.mjs.js, because a plain static host answers a .mjs request with application/octet-stream and browsers refuse to run that as a module script. The engine points ort.env.wasm.wasmPaths.mjs at the renamed file.

Nothing here was retrained or fine-tuned. The float16 conversion of the encoder is a numeric precision change only; it was chosen over int8 because int8 quantization of this encoder measurably destabilized which candidate mask the decoder ranked highest.


Apache License 2.0 (MobileSAM weights)

Copyright belongs to the MobileSAM authors; the text below is the LICENSE file from https://github.com/ChaoningZhang/MobileSAM, retrieved 2026-08-02.

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MIT License (Acly ONNX export of MobileSAM)

Reproduced from the canonical MIT text. The upstream repository https://huggingface.co/Acly/MobileSAM declares license: mit in its metadata but ships no LICENSE file and names no copyright holder, so none is asserted here.

MIT License

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Permission is hereby granted, free of charge, to any person obtaining a copy
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

MIT License (onnxruntime-web)

The LICENSE file from https://github.com/microsoft/onnxruntime, retrieved 2026-08-02.

MIT License

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