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Publish desktop updater 1.0.0-alpha.3
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VTracer Release Bot
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# Changelog
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](http://keepachangelog.com/)
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and this project adheres to [Semantic Versioning](http://semver.org/).
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## 1.0.0-alpha.3 - 2026-08-01
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### Added
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* `vtracer-bench`: a blind fidelity benchmark for raster-to-vector tracers — it compares an original raster against a rendered reconstruction and reports one 0..1 score built from PSNR, SSIM, and a clustered-diff "missing patch" metric (geometric mean, so a single collapsed axis drags the score down). Blind to how the reconstruction was produced: render any tracer's output to pixels and score it. A new workspace crate, separate from the four shipped packages.
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### Fixed
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* Watershed no longer leaks a region along a blurred low-contrast crack as a 1-px filament (a slightly soft image could grow a hairline of one region's color running tens of px down a neighbouring boundary). The boundary snap's mixture gate now also admits pixels that blend two *neighbouring* regions — a blend band belongs to its closer flank even when the basin cut misattributed it to a distant region. On the blurred striped synthetic the circle's max boundary error drops from 31.6 px to 1.5 px; crisp images are byte-unaffected.
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## 1.0.0-alpha.2 - 2026-07-27
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### Added
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* Watershed clustering (`--clustering watershed`): a new region-forming frontend — a hierarchical watershed on the pixel graph (Cousty et al. 2009; Najman et al. 2013), controlled by one dial, `--watershed-detail` (0..=255; each +25.5 roughly doubles the region count). Regions follow image content, with no watershed-line pixels.
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* Boundaries come out calm: antialiased pixels snap to the color-midpoint iso-line instead of meandering with the noise inside the ramp.
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* `stacked` stacks the merge tree itself (coarse ancestors below, refined regions on top), so overdraw stays seam-free.
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* `cutout` gets the partition natively; neighbouring faces closer than `max(2, (255 − detail) / 8)` merge, so faces a human cannot tell apart never survive as separate patches.
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* `WatershedHierarchy` is public, split into `build` (expensive, image-only) and `cut` (near-instant); `Session` re-cuts a cached hierarchy on detail changes, making the slider fully interactive (~25 ms vs ~40 ms on a 1400×775 photo).
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* Curve simplification (`--simplify <tolerance>`, `Config::simplify`, `simplify` in Python and Node; off by default): a paper.js-style Schneider re-fit — each smooth run between corners is redrawn with the fewest cubics that stay within the tolerance (px). Roughly halves file size (sample photo at tolerance 1: 229 → 138 KB stacked, 103 → 36 KB watershed cutout). Runs on fitted geometry before composition, so cutout simplifies each shared boundary once and stays seam-free; corners and junction endpoints stay pinned.
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* Binary thresholding: a tunable fixed threshold (`--threshold`) and Bradley–Roth adaptive thresholding for uneven lighting (`--adaptive`, `--adaptive-window`, `--adaptive-t`) — also on `Config`, Python, and Node.
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* Cutout mode merges neighbouring faces whose colors are within one gradient step, rejoining the near-identical faces that stacked gradient layering splits a smooth area into.
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### Changed
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* `color_mode` is replaced by `clustering` (`color-cluster` | `bw` | `watershed`) across the CLI, Rust, Python, and Node — the field selects the region-forming algorithm, not a color space.
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* The spline fine-tuning flags (`--corner-threshold`, `--segment-length`, `--splice-threshold`) are hidden from CLI help — still accepted, but without their `-c`/`-l`/`-s` short forms. The defaults serve virtually every conversion; `--simplify` supersedes them.
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### Fixed
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* Spline fitting no longer swings far away from the outline around thin strands (a long-standing defect, fixed via visioncortex 0.9.1): a sparse splice slice could be fitted by a single cubic that passed through every sample yet ballooned up to ~30 px sideways between them. Slices are now densified before fitting and multi-cubic fits kept in full, in both stacked mode and the mosaic fitter.
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## 1.0.0-alpha.1 - 2026-07-24
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Ground-up rewrite of VTracer into a **vectorization framework** with pluggable stages.
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### Added
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* Pluggable pipeline: swappable frontend (segmentation), color fitting (incl. custom palettes), curve-fitting backend, and an optimizer pass phase.
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* **Mosaic mode**: true seam-free, gapless tessellation via shared boundary-graph tracing (pixel, polygon, and spline fitters), replacing the old "cutout" that produced seams.
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* SVG optimizer: relative path syntax, shorthand commands, and coordinate-precision reduction for smaller files.
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* `@visioncortex/vtracer` Node.js package (npm): wasm core with a native image reader.
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* Rewritten Python bindings (`vtracer-py`) with a richer API; pyo3 bumped to 0.26 (fixes CPython 3.14 segfaults, #124).
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* CLI accepts positional `input`/`output` arguments (#114).
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### Changed
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* Workspace restructured into `crates/vtracer` (core lib), `crates/vtracer-cli`, `crates/vtracer-py`, and `nodejs/`.
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* CLI upgraded from clap 2.x to 4.x (#118).
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* `filter_speckle` CLI cap raised from 16 to 128, matching the web app (#115).
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* Depends on `visioncortex` 0.9.
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* Python wheel CI now runs only on release tags and manual dispatch, not on every commit.
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### Removed
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* The pre-1.0 `cmdapp` crate and the demo webapp GUI.
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## 0.6.12 - 2026-02-04
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* Python Binding
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## 0.6.5 - 2025-10-17
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* Update `fastrand` to `2.3`
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## 0.6.4 - 2024-03-29
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* Update `visioncortex` version to `0.8.8`
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## 0.6.3 - 2023-11-21
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* New converter API https://github.com/visioncortex/vtracer/pull/59
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## 0.6.1 - 2023-09-23
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* Fixed "The two lines are parallel!"
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### Python Binding
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Thanks to the contribution of [@etjones](https://github.com/etjones), we now have an official Python binding! https://github.com/visioncortex/vtracer/pull/55
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https://pypi.org/project/vtracer/0.6.10/
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## 0.5.0 - 2022-10-09
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* Handle transparent png images (cli) https://github.com/visioncortex/vtracer/pull/23
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## 0.4.0 - 2021-07-23
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* SVG path string numeric precision
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## 0.3.0 - 2021-01-24
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* Added cutout mode
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## 0.2.0 - 2020-11-15
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* Use relative & closed paths
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## 0.1.1 - 2020-11-01
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* SVG namespace
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## 0.1.0 - 2020-10-31
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* Initial release
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