App update

- The library now speaks the image crate's buffer types only:
  fidelity(&RgbImage, &RgbImage, thresh) -> (FidelityReport, GrayImage).
  A tracer embedding the metric pulls no image codec at all.
- New `cli` feature (default on) brings png/jpeg/webp decoding and
  gates the vtracer-bench bin (required-features).
- dssim-core with default features off: drops the rayon thread pool.
- Scores are unchanged: the CLI prints the same value before and after.

CHANGELOG_APP.md

@@ -2,6 +2,57 @@
 
 All notable changes to the VTracer desktop app will be documented in this file.
 
+## 1.0.0-alpha.4 - Build 151 - 2026-09-09
+
+### Added
+
+* An model manager to install/uninstall VTracer 2 engine versions
+* Factory Reset under Settings > Application. It removes everything VTracer 2 and Gen AI keep on the device
+
+### Fixed
+
+* Trial activation issues
+
+## 1.0.0-alpha.4 - Build 143 - 2026-09-08
+
+### Added (Gen AI)
+
+* The FLUX model family, alongside the Stable Diffusion models
+* Art styles for the FLUX models
+* Starring a round in the left panel, each round also shows the model
+* Gradient Step is now determined dynamically, picking the optimal value per artwork
+
+## 1.0.0-alpha.4 - Build 133 - 2026-09-07
+
+### Added
+
+* Gen AI preview. Supports 2 Stable Diffusion model lines, SD Turbo and SDXL Turbo. Requires Vulkan support on Windows. Requires an active VT2 license.
+* The app now offer VTracer 2 engine update.
+
+### Changed
+
+* VTracer 2 composites with Stacked rather than Cutout by default.
+* An expired VTracer 2 trial no longer locks the images you have already traced. They can still be reopened and exported, and only new tracing needs an active licence.
+
+### Fixed
+
+* Retrying VTracer 2 setup after an interrupted install no longer asks for a second device seat for the same machine.
+* A trace with its background removed now sits on a light checkerboard in dark mode.
+
+## 1.0.0-alpha.4 - Build 116 - 2026-08-29
+
+### Added
+
+* VTracer 2 preview. Trial license can be activated in app.
+* SVG saving without a dialog. A preferred save folder can be set in Preferences, or the app can keep asking each time.
+* A source image display preference, choosing smooth or pixelated scaling for the source image.
+* Selected SVG shapes now show their bounds, and can be dragged around the canvas to inspect what sits beneath them.
+* A configurable disk cache limit for VTracer 2, defaulting to 2 GB. Lowering it reclaims space immediately.
+
+### Fixed
+
+* Pasting an image now works consistently across the app rather than only when the canvas held focus.
+
 ## 1.0.0-alpha.3 - Build 59 - 2026-08-14
 
 ### Added

CHANGELOG_VT2.md

@@ -0,0 +1,15 @@
+# VTracer 2 Changelog
+
+All notable changes to the VTracer 2 engine will be documented in this file.
+
+## 2.0.4 - 2026-09-07
+
+* Engine improvement. Traces small circles better
+* Gradient step now allow app to pick optimal value
+
+## 2.0.3 - 2026-08-29
+
+Initial release. Supported systems:
+
+* macOS on Apple Silicon
+* Windows 10 x64 with TPM, Windows 11

Cargo.lock

@@ -194,31 +194,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "crossbeam-deque"
-version = "0.8.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5181e0de7b61eb03a81e347d6dd8797bae9da5146707b51077e2d71a54ec0ceb"
-dependencies = [
- "crossbeam-epoch",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-epoch"
-version = "0.9.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d6914041f254d6e9176c01941b21115dcfb7089e55135a35411081bd106ef3f"
-dependencies = [
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.8.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61803da095bee82a81bb1a452ecc25d3b2f1416d1897eb86430c6159ef717c17"
-
 [[package]]
 name = "crunchy"
 version = "0.2.4"
@@ -239,7 +214,6 @@ checksum = "e3c601412450ff29a9258b2f85b18b38f658caf70fad1692f40ca863d86cb753"
 dependencies = [
  "imgref",
  "itertools 0.14.0",
- "rayon",
  "rgb",
 ]
 
@@ -645,26 +619,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "rayon"
-version = "1.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb39b166781f92d482534ef4b4b1b2568f42613b53e5b6c160e24cfbfa30926d"
-dependencies = [
- "either",
- "rayon-core",
-]
-
-[[package]]
-name = "rayon-core"
-version = "1.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22e18b0f0062d30d4230b2e85ff77fdfe4326feb054b9783a3460d8435c8ab91"
-dependencies = [
- "crossbeam-deque",
- "crossbeam-utils",
-]
-
 [[package]]
 name = "resvg"
 version = "0.45.1"
@@ -994,7 +948,7 @@ dependencies = [
 
 [[package]]
 name = "vtracer-bench"
-version = "1.0.0-alpha.4"
+version = "1.0.0-alpha.6"
 dependencies = [
  "dssim-core",
  "image",

README.md

@@ -8,11 +8,11 @@
   </p>
 
   <h3>
-    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.3/VTracer_1.0.0-alpha.3_x64-setup.exe">Windows App</a>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_x64-setup.exe">Windows App</a>
     <span> | </span>
-    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.3/VTracer_1.0.0-alpha.3_universal.dmg">macOS App</a>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_universal.dmg">macOS App</a>
     <span> | </span>
-    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.3/VTracer_1.0.0-alpha.3_x64.AppImage">Linux App</a>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_x64.AppImage">Linux App</a>
   </h3>
 
   <p>

crates/vtracer-bench/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "vtracer-bench"
 description = "Blind fidelity benchmark for raster-to-vector tracers: compare the original raster with a rendered reconstruction and get one 0..1 fidelity score built from PSNR, SSIM and a clustered-diff patch metric."
-version.workspace = true
+version = "1.0.0-alpha.6"
 authors.workspace = true
 edition.workspace = true
 license.workspace = true
@@ -10,9 +10,20 @@ repository.workspace = true
 categories = ["graphics", "development-tools::testing"]
 keywords = ["vectorization", "benchmark", "fidelity", "ssim", "psnr"]
 
+[features]
+default = ["cli"]
+# The CLI decodes originals and rendered candidates from files; the
+# library itself only speaks the image crate's buffer types, so a
+# tracer embedding the metric pulls no codec at all.
+cli = ["image/png", "image/jpeg", "image/webp"]
+
+[[bin]]
+name = "vtracer-bench"
+required-features = ["cli"]
+
 [dependencies]
 visioncortex.workspace = true
-dssim-core = "3"
+# ~3.4: the only line whose no-`threads` fallback compiles (3.3 and 3.5 both fail)
+dssim-core = { version = "~3.4", default-features = false }
 rgb = "0.8"
-# Decode-only: trimmed to real input formats (drops the AV1 encoder + OpenEXR).
+image = { version = "0.25", default-features = false }
-image = { version = "0.25", default-features = false, features = ["png", "jpeg", "webp"] }

crates/vtracer-bench/src/lib.rs

@@ -26,6 +26,7 @@
 //! weight: it tracks visual accuracy best and is the axis most robust to a
 //! mildly compressed or blurred source.
 
+use image::{GrayImage, RgbImage};
 use visioncortex::BinaryImage;
 
 /// Patch mass fraction that halves the patch subscore.
@@ -77,18 +78,14 @@ fn dssim_score(a_rgb: &[u8], b_rgb: &[u8], w: usize, h: usize) -> f64 {
     val.into()
 }
 
-/// Compare an original against a candidate reconstruction, both RGB8, w×h.
+/// Compare an original against a candidate reconstruction (same
-/// `thresh` is the RGB Euclidean bad-pixel gate (use [`DEFAULT_THRESH`]).
+/// dimensions). `thresh` is the RGB Euclidean bad-pixel gate (use
-/// Returns the report plus the bad-pixel mask (255/0, one byte per pixel).
+/// [`DEFAULT_THRESH`]). Returns the report plus the raw bad-pixel mask
-pub fn fidelity(
+/// (255 = bad).
-    orig_rgb: &[u8],
+pub fn fidelity(orig: &RgbImage, cand: &RgbImage, thresh: f64) -> (FidelityReport, GrayImage) {
-    cand_rgb: &[u8],
+    assert_eq!(orig.dimensions(), cand.dimensions(), "rasters must match in size");
-    w: usize,
+    let (w, h) = (orig.width() as usize, orig.height() as usize);
-    h: usize,
+    let (orig_rgb, cand_rgb) = (orig.as_raw().as_slice(), cand.as_raw().as_slice());
-    thresh: f64,
-) -> (FidelityReport, Vec<u8>) {
-    assert_eq!(orig_rgb.len(), w * h * 3);
-    assert_eq!(cand_rgb.len(), w * h * 3);
 
     // PSNR + RMSE + bad-pixel binarization in one pass
     let mut sse = 0f64;
@@ -185,7 +182,7 @@ pub fn fidelity(
             s_patch,
             fidelity,
         },
-        mask,
+        GrayImage::from_raw(w as u32, h as u32, mask).expect("mask dims"),
     )
 }
 
@@ -197,12 +194,16 @@ mod tests {
         (0..w * h).flat_map(|_| c).collect()
     }
 
+    fn img(w: usize, h: usize, px: &[u8]) -> RgbImage {
+        RgbImage::from_raw(w as u32, h as u32, px.to_vec()).unwrap()
+    }
+
     #[test]
     fn identical_is_one() {
         let a = flat(64, 64, [120, 90, 200]);
-        let (r, mask) = fidelity(&a, &a, 64, 64, DEFAULT_THRESH);
+        let (r, mask) = fidelity(&img(64, 64, &a), &img(64, 64, &a), DEFAULT_THRESH);
         assert_eq!(r.bad_px, 0);
-        assert!(mask.iter().all(|&m| m == 0));
+        assert!(mask.as_raw().iter().all(|&m| m == 0));
         assert!((r.fidelity - 1.0).abs() < 1e-9, "fidelity {}", r.fidelity);
     }
 
@@ -221,8 +222,8 @@ mod tests {
             let (x, y) = ((k % 16) * 4, (k / 16) * 4); // 4px spacing: 256 singleton clusters
             dust[(y * 64 + x) * 3..(y * 64 + x) * 3 + 3].fill(0);
         }
-        let (rb, _) = fidelity(&clean, &blob, 64, 64, DEFAULT_THRESH);
+        let (rb, _) = fidelity(&img(64, 64, &clean), &img(64, 64, &blob), DEFAULT_THRESH);
-        let (rd, _) = fidelity(&clean, &dust, 64, 64, DEFAULT_THRESH);
+        let (rd, _) = fidelity(&img(64, 64, &clean), &img(64, 64, &dust), DEFAULT_THRESH);
         assert_eq!(rb.bad_px, 256);
         assert_eq!(rd.bad_px, 256);
         // dust vanishes under the opening entirely; the blob survives
@@ -252,7 +253,7 @@ mod tests {
                 fil[(y * 64 + x) * 3..(y * 64 + x) * 3 + 3].fill(0);
             }
         }
-        let (rf, _) = fidelity(&clean, &fil, 64, 64, DEFAULT_THRESH);
+        let (rf, _) = fidelity(&img(64, 64, &clean), &img(64, 64, &fil), DEFAULT_THRESH);
         assert_eq!(rf.bad_px, 128);
         assert_eq!(rf.clusters, 0);
         assert!(
@@ -266,8 +267,8 @@ mod tests {
         let a = flat(32, 32, [100, 100, 100]);
         let mild: Vec<u8> = a.iter().map(|&v| v + 4).collect();
         let harsh: Vec<u8> = a.iter().map(|&v| v + 60).collect();
-        let (rm, _) = fidelity(&a, &mild, 32, 32, DEFAULT_THRESH);
+        let (rm, _) = fidelity(&img(32, 32, &a), &img(32, 32, &mild), DEFAULT_THRESH);
-        let (rh, _) = fidelity(&a, &harsh, 32, 32, DEFAULT_THRESH);
+        let (rh, _) = fidelity(&img(32, 32, &a), &img(32, 32, &harsh), DEFAULT_THRESH);
         assert!(rm.fidelity > rh.fidelity);
         assert!(rh.fidelity < 0.4, "harsh {}", rh.fidelity);
     }

crates/vtracer-bench/src/main.rs

@@ -37,22 +37,13 @@ fn main() {
     }
 
     let orig = image::open(&args[1]).expect("open original").to_rgb8();
-    let (w, h) = (orig.width() as usize, orig.height() as usize);
+    let cand = image::open(&args[2]).expect("open candidate").to_rgb8();
-    let img = image::open(&args[2]).expect("open candidate").to_rgb8();
+    assert_eq!(cand.dimensions(), orig.dimensions(), "candidate raster must match original dimensions");
-    assert_eq!(
-        (img.width() as usize, img.height() as usize),
-        (w, h),
-        "candidate raster must match original dimensions"
-    );
-    let cand: Vec<u8> = img.into_raw();
 
-    let (r, mask) = fidelity(orig.as_raw(), &cand, w, h, thresh);
+    let (r, mask) = fidelity(&orig, &cand, thresh);
 
     if let Some(out) = mask_out {
-        image::GrayImage::from_raw(w as u32, h as u32, mask)
+        mask.save(&out).expect("save mask");
-            .unwrap()
-            .save(&out)
-            .expect("save mask");
     }
 
     println!(

crates/vtracer-py/README.md

@@ -8,9 +8,11 @@
   </p>
 
   <h3>
-    <a href="https://www.visioncortex.org/vtracer/">Web App</a>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_x64-setup.exe">Windows App</a>
     <span> | </span>
-    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.3/VTracer_1.0.0-alpha.3_x64-setup.exe">Windows App</a>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_universal.dmg">macOS App</a>
+    <span> | </span>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_x64.AppImage">Linux App</a>
   </h3>
 
 </div>

nodejs/README.md

@@ -8,9 +8,11 @@
   </p>
 
   <h3>
-    <a href="https://www.visioncortex.org/vtracer/">Web App</a>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_x64-setup.exe">Windows App</a>
     <span> | </span>
-    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.3/VTracer_1.0.0-alpha.3_x64-setup.exe">Windows App</a>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_universal.dmg">macOS App</a>
+    <span> | </span>
+    <a href="https://github.com/visioncortex/vtracer/releases/download/1.0.0-alpha.4/VTracer_1.0.0-alpha.4_x64.AppImage">Linux App</a>
   </h3>
 
 </div>