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Image Trace: Flat Logo can trace only the named colors, without a white of its own
Image Trace: Flat Logo can trace only the named colors, without a white of its own ## What and why Flat Logo always traces white (every channel 245 or more) as a color of its own, even when `logoColors` names every color the art uses. Art with white areas beside the named colors comes back with a fourth color, `#ffffff`, for those areas. A new trace parameter, `logoWhite` (default `true`, so today's results do not change), turns that class off when `logoColors` is given. White areas then take the named color nearest white (the first of equally near ones), with their edges where they are, a named white or near-white is used as named, and enclosed transparent areas stay hole
- Status
- open
- Score
- 0.00
- Adopters
- 0 other operators
- Author
- dotCooCoo (imported from pull request #3946, open)
- Base
f792c63597f289d0bfb914fd06255cd1e4c8852d- Size
- +201 −17 in 7 files
- Review
- pending
- Shared
- 2026-10-28
- Id
b1c5d0c36ea1f438e0f8ceef
How it went
No other operator has reported using it yet.
Diff
raw · crates/engine/src/cmd/buildcmds.rs crates/engine/src/tests_build.rs crates/trace/src/lib.rs crates/trace/src/logo/pipeline.rs crates/trace/src/logo/tests.rs docs/image-trace-adjustments.md docs/target-app-parity.md
@@ -129,7 +129,7 @@ pub fn specs() -> Vec<CommandSpec> { "Make", ["Object", "Image Trace"], None,- "{id?: image or Image Trace group (default: selection), preset?: name (imageTrace.presets), enhanced?: false (the preset's enhanced version: with Auto Grouping, and with Shapes in all but High Fidelity Photo; Flat Logo has none and is traced as it is), params?: {mode: \"blackAndWhite\"|\"grayscale\"|\"color\"|\"logo\", threshold: 0-255, palette: \"limited\"|\"fullTone\"|\"automatic\"|\"documentLibrary\" (color mode; limited: the `colors` best colours, fullTone: as many as the tones need, more with colorDetail, automatic: flat art with its own colours, else fullTone, documentLibrary: at most `colors` of the library's colours, as they are), colors: 2-256, colorDetail: 0-100 (fullTone, automatic), library: \"document\" (the document's swatches) or a swatch library id or name (swatch.library.list; documentLibrary), paths: 0-100, corners: 0-100, noise: px, method: \"abutting\"|\"overlapping\", ignoreWhite (leave out white areas), ignoreColor?: \"#rrggbb\" (with ignoreWhite: the colour left out instead of white), snapCurvesToLines, shapes: false (filled outlines that are a circle, an ellipse, a rectangle or a regular polygon come out as that live shape), autoGrouping: false (each path that has others inside it is grouped with them), gradients: false (grayscale and color: an area whose colour changes evenly along one direction is one path with a linear gradient fill), fills: true, strokes: false (Create: lines up to strokeWidth wide become stroked centre lines; without fills, wider areas become stroked outlines), strokeWidth: px (10), logoColors?: [\"#rrggbb\"…] (mode logo: flat-colour logos only; colours found automatically or named here, white is always its own colour, at most ten; noise = areas under noise/10 px ignored; edges to a fraction of a pixel, sharp corners restored, lines and circles snapped; enclosed transparent areas are painted white unless ignoreWhite makes them holes; fills/strokes are ignored; gradients and photos are refused)}, view?: as imageTrace.setView (default: the traced object's own, else tracingResult), ids?: [id…] (instead of id)} → {id, paths, anchors, colors, warnings: [text…] (the image is over 1500 px on a side, so it traces more slowly; or it was traced scaled down; Flat Logo names only the size it traced a larger image at)}",+ "{id?: image or Image Trace group (default: selection), preset?: name (imageTrace.presets), enhanced?: false (the preset's enhanced version: with Auto Grouping, and with Shapes in all but High Fidelity Photo; Flat Logo has none and is traced as it is), params?: {mode: \"blackAndWhite\"|\"grayscale\"|\"color\"|\"logo\", threshold: 0-255, palette: \"limited\"|\"fullTone\"|\"automatic\"|\"documentLibrary\" (color mode; limited: the `colors` best colours, fullTone: as many as the tones need, more with colorDetail, automatic: flat art with its own colours, else fullTone, documentLibrary: at most `colors` of the library's colours, as they are), colors: 2-256, colorDetail: 0-100 (fullTone, automatic), library: \"document\" (the document's swatches) or a swatch library id or name (swatch.library.list; documentLibrary), paths: 0-100, corners: 0-100, noise: px, method: \"abutting\"|\"overlapping\", ignoreWhite (leave out white areas), ignoreColor?: \"#rrggbb\" (with ignoreWhite: the colour left out instead of white), snapCurvesToLines, shapes: false (filled outlines that are a circle, an ellipse, a rectangle or a regular polygon come out as that live shape), autoGrouping: false (each path that has others inside it is grouped with them), gradients: false (grayscale and color: an area whose colour changes evenly along one direction is one path with a linear gradient fill), fills: true, strokes: false (Create: lines up to strokeWidth wide become stroked centre lines; without fills, wider areas become stroked outlines), strokeWidth: px (10), logoColors?: [\"#rrggbb\"…] (mode logo: flat-colour logos only; colours found automatically or named here, white is its own color unless logoWhite is false, at most ten; noise = areas under noise/10 px ignored; edges to a fraction of a pixel, sharp corners restored, lines and circles snapped; enclosed transparent areas are painted white unless ignoreWhite makes them holes; fills/strokes are ignored; gradients and photos are refused), logoWhite: true (mode logo with logoColors named; false traces the named colors only: white areas take the nearest of them, a named white is kept and enclosed transparent areas stay holes; with ignoreWhite, white areas are left out either way)}, view?: as imageTrace.setView (default: the traced object's own, else tracingResult), ids?: [id…] (instead of id)} → {id, paths, anchors, colors, warnings: [text…] (the image is over 1500 px on a side, so it traces more slowly; or it was traced scaled down; Flat Logo names only the size it traced a larger image at)}", has_selection_or_ids, |s, p| trace_make(s, p, false) ),@@ -2675,6 +2675,43 @@ fn image_trace_flat_logo_refuses_a_gradient_and_a_bad_palette() { assert_eq!(r["colors"], 1); } +#[test]+fn image_trace_flat_logo_can_trace_only_the_named_colors() {+ // A light disc in a black ring, a blue square on it, and a white spot.+ let art = vectorcraft_trace::Raster::from_fn(120, 120, |x, y| {+ let (fx, fy) = (f64::from(x) + 0.5, f64::from(y) + 0.5);+ let d = (fx - 60.0).hypot(fy - 60.0);+ if (fx - 32.0).hypot(fy - 40.0) <= 6.0 {+ [255, 255, 255, 255]+ } else if (45..75).contains(&x) && (45..75).contains(&y) {+ [40, 120, 240, 255]+ } else if d <= 46.0 {+ [240, 240, 220, 255]+ } else if d <= 50.0 {+ [0, 0, 0, 255]+ } else {+ [0, 0, 0, 0]+ }+ });+ let fills = |logo_white: bool| {+ let mut s = session();+ add_image(&mut s, &art, Affine::IDENTITY);+ let params = json!({"params": {"mode": "logo", "logoColors": ["#000000", "#F0F0DC", "#2878F0"], "logoWhite": logo_white}});+ let r = s.execute("imageTrace.makeAndExpand", ¶ms).unwrap();+ let g = node(&s, NodeId(r["id"].as_u64().unwrap()));+ let mut hex: Vec<String> = g.children().unwrap().iter().filter_map(|n| n.appearance.fill_paint().color()).map(|c| c.to_hex()).collect();+ hex.sort();+ hex.dedup();+ (r["colors"].clone(), hex)+ };+ let (colors, hex) = fills(true);+ assert_eq!(colors, 4);+ assert!(hex.contains(&"#ffffff".to_string()), "{hex:?}");+ let (colors, hex) = fills(false);+ assert_eq!(colors, 3);+ assert_eq!(hex, ["#000000", "#2878f0", "#f0f0dc"]);+}+ #[test] fn image_trace_object_remembers_its_settings() { let mut s = session();@@ -314,9 +314,16 @@ pub struct TraceParams { /// Stroke: the widest feature (px) traced as a stroke. pub stroke_width: f64, /// Flat Logo mode: the flat colours (`#rrggbb`) to use; empty finds them automatically. White is- /// always traced on its own and cannot be named, colours closer than about 12 (RGB distance)- /// count as one, and at most ten are used. (Not `palette`: that is Color mode's colour source.)+ /// traced on its own and cannot be named unless [`logo_white`](Self::logo_white) is off, colours+ /// closer than about 12 (RGB distance) count as one, and at most ten are used. (Not `palette`:+ /// that is Color mode's colour source.) pub logo_colors: Vec<String>,+ /// Flat Logo mode with named `logo_colors`: `true` traces white (every channel 245 or more) as a+ /// color of its own beside the named ones. `false` traces the named colors only: white areas+ /// take the nearest of them, a named white or near-white is used as named, and enclosed+ /// transparent areas stay holes. With the colors found automatically, white is always its own,+ /// and with [`ignore_white`](Self::ignore_white) white areas are left out whatever this says.+ pub logo_white: bool, } impl Default for TraceParams {@@ -344,6 +351,7 @@ impl Default for TraceParams { strokes: false, stroke_width: 10.0, logo_colors: Vec::new(),+ logo_white: true, } } }@@ -353,22 +353,38 @@ fn plane_at(planes: &[Vec<f32>], class: usize, i: usize) -> f32 { planes.get(class).and_then(|p| p.get(i)).copied().unwrap_or(0.0) } -/// The unmixing classes for a palette: each colour, then white, then transparent.-fn classes_for(palette: &[[u8; 3]]) -> Vec<[f64; 4]> {+/// The unmixing classes for a palette: each colour, then white (when `own_white`), then transparent.+fn classes_for(palette: &[[u8; 3]], own_white: bool) -> Vec<[f64; 4]> { let mut classes: Vec<[f64; 4]> = palette.iter().map(|c| [f64::from(c[0]) / 255.0, f64::from(c[1]) / 255.0, f64::from(c[2]) / 255.0, 1.0]).collect();- classes.push([1.0, 1.0, 1.0, 1.0]);+ if own_white {+ classes.push([1.0, 1.0, 1.0, 1.0]);+ } classes.push([0.0, 0.0, 0.0, 0.0]); classes } +/// Whether white is traced as a class of its own: always, unless the caller named the colors and+/// turned [`TraceParams::logo_white`] off. With Ignore White it is, so white areas are left out.+fn own_white(params: &TraceParams) -> bool {+ params.logo_white || params.logo_colors.is_empty() || params.ignore_white+}++/// Without a white class of its own: the palette color that takes white's coverage, the one+/// nearest white (the first of equally near ones). `None` when a named color is white already+/// (closer than [`SAME_COLOUR`]), so white needs no class to unmix with.+fn white_goes_to(palette: &[[u8; 3]]) -> Option<usize> {+ let (i, d) = palette.iter().enumerate().map(|(i, &c)| (i, distance(c, [255; 3]))).min_by(|a, b| a.1.total_cmp(&b.1))?;+ (d >= SAME_COLOUR).then_some(i)+}+ fn distance(a: [u8; 3], b: [u8; 3]) -> f64 { (0..3).map(|k| (f64::from(a[k]) - f64::from(b[k])).powi(2)).sum::<f64>().sqrt() } type Colours = Vec<[u8; 3]>; -/// The colours to trace: those the caller named (white is always its own class so it is skipped;+/// The colours to trace: those the caller named (white is skipped when it is its own class; /// colours closer than [`SAME_COLOUR`] count as one; at most [`MAX_COLOURS`]) or the ones found, /// the tones of one colour folded into it ([`fold_tones`]); and with them the colours before folding. fn choose_palette(params: &TraceParams, pix: &[Px], w: usize, h: usize) -> Result<(Colours, Colours), TraceError> {@@ -380,7 +396,7 @@ fn choose_palette(params: &TraceParams, pix: &[Px], w: usize, h: usize) -> Resul for s in ¶ms.logo_colors { // Every entry is checked, but only the first few distinct colours are kept. let c = parse_hex(s).ok_or_else(|| TraceError::BadPalette(s.clone()))?;- let white = c.iter().all(|&v| v >= WHITE_MIN);+ let white = own_white(params) && c.iter().all(|&v| v >= WHITE_MIN); if palette.len() < MAX_COLOURS && !white && !palette.iter().any(|&q| distance(q, c) < SAME_COLOUR) { palette.push(c); }@@ -405,7 +421,11 @@ pub(crate) fn trace_logo(img: &Raster, params: &TraceParams, max_anchors: usize) if fraction < MIN_FLAT { return Err(TraceError::NotFlat { fraction }); }- let mut classes = classes_for(&palette);+ let own_white = own_white(params);+ // Without a white of its own, white is still unmixed as a class, so blended edges split where+ // they are, and its coverage is then added to the color it goes to.+ let merge_white = if own_white { None } else { white_goes_to(&palette) };+ let mut classes = classes_for(&palette, own_white || merge_white.is_some()); // A very busy image is averaged down further until the unmixing work is bounded. for _ in 0..6 { if count_ambiguous(&pix, &classes) <= EDGE_BUDGET || w * h <= 16_384 {@@ -423,15 +443,28 @@ pub(crate) fn trace_logo(img: &Raster, params: &TraceParams, max_anchors: usize) palette.extend(extra.into_iter().take(MAX_COLOURS - palette.len())); // (A colour nothing explained may be one more tone of a colour that is there.) palette = fold_tones(&pix, palette);- classes = classes_for(&palette);+ classes = classes_for(&palette, own_white); unmix(&pix, w, h, &classes).0 } } else { std::mem::take(&mut planes) };- let (white, transparent) = (palette.len(), palette.len() + 1);+ if let Some(to) = merge_white+ && palette.len() < planes.len()+ {+ let white_plane = planes.remove(palette.len());+ if let Some(target) = planes.get_mut(to) {+ for (t, v) in target.iter_mut().zip(&white_plane) {+ *t += *v;+ }+ }+ }+ // Without a white class, `white` is an index no class has.+ let (white, transparent) = if own_white { (palette.len(), palette.len() + 1) } else { (usize::MAX, palette.len()) }; let aliased = soften_if_aliased(&mut planes, w, h);- fill_knockouts(&mut planes, w, h, white, transparent);+ if own_white {+ fill_knockouts(&mut planes, w, h, white, transparent);+ } let n = w * h; let dominant: Vec<u8> = (0..n) .map(|i| (0..planes.len()).max_by(|&a, &b| plane_at(&planes, a, i).total_cmp(&plane_at(&planes, b, i))).unwrap_or(transparent) as u8)@@ -474,7 +507,7 @@ pub(crate) fn trace_logo(img: &Raster, params: &TraceParams, max_anchors: usize) let to_source = ToSource { factor: factor as f64, work: (w, h), source: (w0, h0) }; let mut shapes: Vec<Kept> = Vec::new(); let mut anchors_made = 0usize;- for class in 0..=white {+ for class in 0..transparent { if class == white && params.ignore_white { continue; }@@ -488,8 +521,9 @@ pub(crate) fn trace_logo(img: &Raster, params: &TraceParams, max_anchors: usize) if a2.abs() / 2.0 < min_area { continue; }- // Holes are cut only under Ignore White; otherwise white and the other colors are traced as their own shapes.- if a2 >= 0.0 && !params.ignore_white {+ // Holes are cut only under Ignore White or with no white class; otherwise white and the other colors are+ // traced as their own shapes.+ if a2 >= 0.0 && !(params.ignore_white || !own_white) { continue; } // More real outlines than we will fit is refused, not silently truncated.@@ -499,8 +533,9 @@ pub(crate) fn trace_logo(img: &Raster, params: &TraceParams, max_anchors: usize) let pts = to_pixels(&lp, u); if a2 < 0.0 { outers.push((a2.abs() / 2.0, pts)) } else { holes.push(pts) } }- // Each hole belongs to the smallest outline that contains it, and to no other.- let owner: Vec<Option<usize>> = if params.ignore_white {+ // Each hole belongs to the smallest outline that contains it, and to no other. (Holes are+ // cut where white does not paint over them: with Ignore White, or with no white class.)+ let owner: Vec<Option<usize>> = if params.ignore_white || !own_white { holes .iter() .map(|hole| {@@ -62,6 +62,9 @@ fn render(w: u32, h: u32, blur: f64, shade: impl Fn(f64, f64) -> Option<[u8; 3]> const RED: [u8; 3] = [210, 40, 50]; const BLUE: [u8; 3] = [40, 80, 200];+const LIGHT: [u8; 3] = [240, 240, 220];+const SKY: [u8; 3] = [40, 120, 240];+const WHITE: [u8; 3] = [255, 255, 255]; fn logo_params() -> TraceParams { TraceParams {@@ -205,6 +208,99 @@ fn the_named_palette_is_used_exactly_and_a_bad_one_is_an_error() { assert!(matches!(trace_within(&img, &bad, 1000), Err(TraceError::BadPalette(s)) if s == "red")); } +/// The color of the topmost path at `p` (paths are listed bottom first).+fn top_color(res: &TraceResult, p: Point) -> Option<[u8; 3]> {+ res.paths.iter().rev().find(|t| t.path.to_bezpath().winding(p) != 0).map(|t| t.color)+}++#[test]+fn logo_white_off_traces_only_the_named_colors() {+ // A light disc in a black ring, a blue square on it, and two white spots.+ let img = render(120, 120, 0.7, |x, y| {+ let d = (x - 60.0).hypot(y - 60.0);+ if (x - 32.0).hypot(y - 40.0) <= 6.0 || (x - 78.0).hypot(y - 86.0) <= 6.0 {+ Some(WHITE)+ } else if (45.0..=75.0).contains(&x) && (45.0..=75.0).contains(&y) {+ Some(SKY)+ } else if d <= 46.0 {+ Some(LIGHT)+ } else if d <= 50.0 {+ Some([0, 0, 0])+ } else {+ None+ }+ });+ let named = TraceParams { logo_colors: vec!["#000000".into(), "#F0F0DC".into(), "#2878F0".into()], ..logo_params() };+ // By default white is a fourth color.+ let res = trace(&img, &named);+ assert_eq!(res.palette.len(), 4, "{:?}", res.palette);+ assert_eq!(top_color(&res, Point::new(32.0, 40.0)), Some(WHITE));+ // Without it, the three named colors only: the white spots take the light color.+ let res = trace(&img, &TraceParams { logo_white: false, ..named.clone() });+ assert_eq!(res.palette.len(), 3, "{:?}", res.palette);+ assert!(!res.palette.contains(&WHITE));+ for p in [Point::new(32.0, 40.0), Point::new(78.0, 86.0), Point::new(20.0, 60.0)] {+ assert_eq!(top_color(&res, p), Some(LIGHT), "at {p:?}");+ }+ assert_eq!(top_color(&res, Point::new(60.0, 60.0)), Some(SKY));+ assert_eq!(top_color(&res, Point::new(60.0, 12.0)), Some([0, 0, 0]));+ assert!(!covered(&res, Point::new(5.0, 5.0)));+ // Ignore White still leaves the white spots out.+ let res = trace(&img, &TraceParams { logo_white: false, ignore_white: true, ..named.clone() });+ for p in [Point::new(32.0, 40.0), Point::new(78.0, 86.0)] {+ assert!(!covered(&res, p), "at {p:?}");+ }+ assert_eq!(top_color(&res, Point::new(20.0, 60.0)), Some(LIGHT));+}++#[test]+fn logo_white_off_keeps_a_named_white_and_knockouts_as_holes() {+ let disc = render(64, 64, 0.7, |x, y| ((x - 32.0).hypot(y - 32.0) <= 20.0).then_some(WHITE));+ let only_white = TraceParams { logo_colors: vec!["#ffffff".into()], logo_white: false, ..logo_params() };+ let res = trace(&disc, &only_white);+ assert_eq!(res.paths.len(), 1);+ assert_eq!(res.paths[0].color, WHITE);+ // An enclosed transparent area stays a hole: there is no white to paint it with.+ let ring = render(64, 64, 0.7, |x, y| (12.0..=25.0).contains(&(x - 32.0).hypot(y - 32.0)).then_some(BLUE));+ let res = trace(&ring, &TraceParams { logo_colors: vec!["#2850c8".into()], logo_white: false, ..logo_params() });+ assert_eq!(res.paths.len(), 1);+ assert_eq!(res.paths[0].path.subpaths.len(), 2, "outer outline and a hole");+ assert!(!covered(&res, Point::new(32.0, 32.0)), "the hole must be empty");+ assert!(covered(&res, Point::new(32.0, 32.0 + 18.0)), "the ring itself is filled");+}++#[test]+fn logo_white_off_gives_each_white_the_nearest_named_color() {+ // Red and blue are equally far from white: the white disc takes the first one named.+ let disc = render(64, 64, 0.7, |x, y| ((x - 32.0).hypot(y - 32.0) <= 20.0).then_some(WHITE));+ let params = TraceParams { logo_colors: vec!["#ff0000".into(), "#0000ff".into()], logo_white: false, ..logo_params() };+ let res = trace(&disc, ¶ms);+ assert_eq!(top_color(&res, Point::new(32.0, 32.0)), Some([255, 0, 0]));+ assert!(!covered(&res, Point::new(5.0, 5.0)));+ // Each white takes the named color nearest it, so two named whites both stay.+ const OFF: [u8; 3] = [245, 245, 245];+ let two = render(96, 64, 0.7, |x, y| {+ if (x - 24.0).hypot(y - 32.0) <= 16.0 {+ Some(OFF)+ } else if (x - 72.0).hypot(y - 32.0) <= 16.0 {+ Some(WHITE)+ } else {+ None+ }+ });+ let params = TraceParams { logo_colors: vec!["#f5f5f5".into(), "#ffffff".into()], logo_white: false, ..logo_params() };+ let res = trace(&two, ¶ms);+ assert_eq!(top_color(&res, Point::new(24.0, 32.0)), Some(OFF));+ assert_eq!(top_color(&res, Point::new(72.0, 32.0)), Some(WHITE));+ // A white square on blue keeps its edges where they are when it turns red.+ let square = render(100, 100, 0.7, |x, y| Some(if (30.0..70.0).contains(&x) && (30.0..70.0).contains(&y) { WHITE } else { [0, 0, 255] }));+ let res = trace(&square, &TraceParams { logo_colors: vec!["#ff0000".into(), "#0000ff".into()], logo_white: false, ..logo_params() });+ for (inside, outside) in [(30.3, 29.7), (69.7, 70.3)] {+ assert_eq!(top_color(&res, Point::new(inside, 50.0)), Some([255, 0, 0]), "at x {inside}");+ assert_eq!(top_color(&res, Point::new(outside, 50.0)), Some([0, 0, 255]), "at x {outside}");+ }+}+ #[test] fn a_large_image_is_traced_at_reduced_size_and_scaled_back() { let (cx, cy, r) = (1200.0, 600.0, 400.0);@@ -32,6 +32,13 @@ white beside a cream), at most six; scattered specks of a colour add none. Adobe its own palettes are chosen; this is VectorCraft's own method (see [image-trace-quality.md](image-trace-quality.md#auto-color-keeps-rare-colours)). +**Flat Logo colors.** Flat Logo traces white (every channel 245 or more) as a color of its own beside+the colors named in `logoColors`. With `"logoWhite": false` in the params of `imageTrace.make` or+`imageTrace.makeAndExpand`, it traces the named colors only: white areas take the nearest named color,+a named white or near-white is used as named, and enclosed transparent areas stay holes instead of+being painted white. When Flat Logo finds the colors itself, `logoWhite` has no effect, and with+`ignoreWhite` white areas are left out whatever `logoWhite` says.+ **Abutting and Overlapping.** Abutting is the default Method, and the Default, Auto Color, 3 Colors, 6 Colors and 16 Colors presets use it. With Abutting, two neighboring colors share one exact edge. The canvas smooths the edges of each path on its own, so each of the two paths covers only part of the@@ -802,6 +802,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur - **Image Trace, measured:** `crates/trace/tests/quality` traces drawings made from known vector art with every preset and [`image-trace-quality.md`](image-trace-quality.md) records the numbers against the baseline. Black and White, Grayscale and Color place each edge by the blend of the pixels across it (to a fraction of a pixel on anti-aliased and blurred images; hard-edged images are read as staircases) and fit outlines as Flat Logo does. *Measured* on each preset's own inputs, all sizes and variants: Default's outlines went from 0.31 px off on average to 0.09 (largest 1.51 to 1.02), Black and White Logo's from 0.27 to 0.06 with 0.3 kinks per trace where it had 15, and the gaps between abutting paths from 64 px to 22. On clean curved shapes Black and White Logo is 0.02 px off (the open tracer measured beside it: 0.20). The palette is made of the picture's own colours (blends along edges take none of it, colours that noise made of one colour merge, a blend pixel goes to one of the two colours it lies between; #1504): 16 Colors on flat art, all variants, went from 70 paths to 4.2 and from 5.1 px off to 0.13, with no path left in a colour the art doesn't have (5.9 before). Photos are smoothed within their tones before they are quantised and stacked layers go by lightness (#1516): High Fidelity Photo went from 3,653 paths to 121 with its colour error down from 2.30 to 1.75, and a 16 megapixel photo-like image is traced in 3.5 s where 4 megapixels were refused. Since then, by the same harness: outlines are cut at their junctions and each shared piece is fitted once (#1535: gaps and overlaps between abutting paths 22 to 50 px of area down to under 2); layers are traced within the box of their pixels and a few at a time (#1546: a 16 megapixel photo 3.9 GB to 0.9 GB); black and white are read against the image's own black and the paper near each edge (#1563, for thin lines in blurred and scanned art); Ignore Color and the Auto Color and Outline presets (#1574); Snap Curves To Lines levels lines within 2.5 degrees of level or upright (#1593, the angle our choice); Create: Strokes puts centre lines in the middle of their ink and makes them as wide as it (#1595: Outline 0.295 to 0.052 px from the true centre line, 18.4 to 2.7 anchors a stroke); sharp corners whose pixel is mostly outside the shape stay corners (#1609: Default 69% to 76% kept). Three options, each off unless asked for as the legacy presets have them: Shapes (#1609: 57 to 62% of plain circles, ellipses, rectangles and regular polygons come out as live shapes, rounded rectangles rarely), Auto Grouping (#1618: paths grouped with what lies inside them, the same picture) and Gradients (#1627: linear gradients traced as one gradient-filled path; on gradient inputs 6 Colors' colour error 2.12 to 0.62 with 6.4 to 3.4 paths, none found in flat art). Snap Curves To Lines moves no end of a line by more than 1.6 px, so long lines a degree or two off stay as the image has them (#1647: Technical Drawing's largest distance 4.21 px to 1.46). Flat Logo takes the tones a scan's uneven paper makes of one colour for one colour (#1657: on scans 470 paths and 21 px off to 8.5 paths and 0.09 px). Shapes finds rounded rectangles and shapes in aliased, blurred and scanned art (#1845: 57 to 62% of the plain shapes up to 98 to 100%, no false shape but one line 2 px wide). Stroked lines get square caps where their ink is cut square, and a wide end that turned towards a corner goes back on its line (#1846: Outline's largest distance 2.94 px to 0.88, 14 anchors to 10). Each of the 14 documented presets has an enhanced version with Auto Grouping and, in all but High Fidelity Photo, Shapes (#1847), measured beside its preset: equal or better within 0.005 px and 1% of edge ΔE on every preset's own inputs (Default 0.091 to 0.083 px); Auto Grouping keeps traced order in its groups, which removed a light seam along the counters of letters. Gradients grows a gradient over the pixels noise and soft rims took off it (#1848: blurred and noisy linear gradients 3 to 11 paths beside the gradient down to 0.5 with 6 Colors, 24 to 56 down to 0.5 to 1.5 with High Fidelity Photo). Silhouettes is 0.52 px off because its threshold is 200 (0.11 px at 128). Still weak, by the same numbers: rounded rectangles and other line-and-arc outlines take 12 to 16 anchors (the fitter does not split lines from arcs), blurred and scanned polygons lose corners, hairlines under half a pixel are lost to the threshold, aliased art is about 0.25 px off, a scan's uneven paper splits into tones when more colours are asked for than the art has, stroke junctions stay at their skeleton pixels, a three-stop gradient in a small or scanned disc is not found, radial gradients stay bands (a draft, #1849, traces them; the documented option is for linear ones, so it waits for a decision), near-regular polygons a few dozen pixels across are made regular with Shapes (up to 0.5 px off), and aliased stroked lines are 0.8 px off at worst. - **Gradient mesh from an image:** Object › Create Gradient Mesh (`object.mesh.create`) on an embedded image makes a mesh of 1 to 50 rows and columns over the picture's rectangle, placed with the image's transform; each point takes the alpha-weighted average colour and the opacity of the area around it, and Appearance and Highlight apply. A linked image is refused with a message to embed it (#1676). Scores and hours unchanged. - **Image Trace Flat Logo mode:** a fourth mode beside Black and White, Grayscale and Color, for flat-colour logos. Each pixel is read as a blend of the logo's colours (found automatically or named), the blend is interpolated smoothly and every outline is placed where two colours are equally present, so edges are accurate to a fraction of a pixel. Outlines are then cleaned: corners the blur rounded are put back, near-straight runs and near-circular arcs become exact lines and arcs, the rest is fitted with as few Béziers as the tolerance allows, touching colours overlap by a hair so no gap opens, and an outline that strays from the raw contour is fitted plainly instead. Gradients and photos are refused with advice to use Color. Line art whose only solid area is white paper (strokes a pixel or two wide) takes its colours from the strokes' cores, with the lighter shades along a stroke's anti-aliased edge folded into its ink; a page whose ink (a channel at least 48 below white) covers under 1% of it traces to nothing, as blank paper does. *Measured* (a local experiment, not run in CI): a flat-colour logo's vector original was rendered down to a soft 199 × 100 px transparent PNG, traced, and the result compared with the original at 1600 px wide. The built-in colour presets (6 Colors, 16 Colors, High Fidelity Photo, Low Fidelity Photo) had a mean edge error of 2.5 to 3.4 px and region overlap of 0.88 to 0.91; Flat Logo had 0.78 px and 0.966 (0.48 px and 0.975 from a crisp source), in about 0.1 s. Limits: flat-colour art only; needle-thin sharp tips are shortened by about 1.7 source pixels because the blur erases them; it works at no more than 1024 px on the long side (larger images are averaged down first); only one logo family has been scored against a vector original.+- **Image Trace, Flat Logo named colors only:** with `logoColors` named, `"logoWhite": false` traces those colors only, so white areas take the nearest of them and no white is added; a named white is kept, and enclosed transparent areas stay holes; code-drawn tests in `crates/trace` and `crates/engine`. - **Advanced art:** live Blends (steps/distance/smooth colour, editable spine, anchor-targeted Blend tool, faithful interpolation, knockout), Envelope Distort (warp/mesh/top object, Reset, full Envelope Options, mesh handles, Edit Contents; type, images, symbols, gradients, patterns and appearance distorted everywhere), Liquify tools with options and pen pressure, Puppet Warp with rotating pins, Perspective Grid with presets, movable planes and projected type (choosing a perspective tool shows the grid; Hide Grid hides it with the tool still chosen), Gradient Mesh, Shape Builder (stroke-only open paths and lines cut the regions they cross and enclose regions of their own, and regions they bound merge without seams where the lines cross at rounded coordinates (#893); filled open paths count as closed; erase mode while Alt/Option is held: a minus pointer, red highlights of what will go, a click or drag deletes the regions touched, the pieces of open lines and the edges (outline pieces between the points where paths meet, opening their paths there) it passes over, one undo step, `shapeBuilder.merge {erase}` and `shapeBuilder.regions` edges over MCP), Live Paint (every path an edge, open lines included), Image Trace (12 presets, colour layers traced in parallel; a trace past two million anchor points is refused with advice rather than running out of memory, an image over 64 megapixels is traced scaled down to that size (aspect kept, paths at the image's own size) and one over 192 megapixels is refused, and a selection too large to outline shows its bounds (#525); Object › Image Trace › Make and Make and Expand trace at once with the Default preset, #543; with an image selected the Control bar and the Properties panel show Image Trace, whose arrow traces with any preset, Mask (`object.maskImage`: a clipping path on the image's outline, selected so its handles crop), Crop Image (a crop box on the image, starting on its part over the artboard, dragged by its handles or inside it, the outside dimmed, with X/Y/W/H, Apply and Cancel in the Control bar, Enter and Escape, #734; `object.cropImage {rect}` for agents, `{trim: true}` cuts an image to its pixels that aren't fully transparent, pixel for pixel) and Embed or Unembed in place of Fill and Stroke; with an Image Trace object selected, its Preset (choosing another traces again), View, the Image Trace panel and Expand, plus Release in Properties; the five View modes (Tracing Result, with Outlines, Outlines, Outlines with Source Image, Source Image) redraw a trace on screen without tracing again, are saved with it and `imageTrace.setView` sets them, while exports and Expand keep the result; the panel's Advanced section is a header that stays open or closed as it was left (part of #641); Color mode's Palette: Limited, Full Tone (as many colours as the tones need, Less … More), Automatic (flat art with its own colours, else Full Tone; a heuristic) and Document Library (the most used colours of the document's swatches or a swatch library, filled with the swatch colours as they are), part of #641; Advanced › Create: Fills and/or Strokes, where lines up to the Stroke width trace as stroked centre lines (distance transform, thinning, a skeleton graph with spurs pruned, curve fitting; one width per line; without Fills, wider areas become stroked outlines), part of #641), pattern swatches with pattern editing mode, live Repeat (radial/grid/mirror). A single selected mirror repeat shows a prominent axis with a center move handle and two rotation handles. Drag the line or center to change spacing, or an end to change angle; Shift snaps rotation to 45°. The original artwork stays in place, the reflected copy previews live, Escape cancels and each drag takes one undo step through `object.repeat.options`. Controls follow zoom/view rotation and hide with edges or the bounding box. Engine and headless canvas regressions passed for gestures, history and visibility; native move, rotation and Escape screenshots were reviewed. [Public mirror-repeat reference](https://helpx.adobe.com/illustrator/desktop/paint-and-fill/create-and-edit-patterns/set-mirror-repeat-options.html). Object › Expand turns radial, grid and mirror repeats into groups of their instances (#1765, #1756). Window › Blend exposes easing Type, Ramp and independent color Shift through `object.blend.options`. The four polynomial distributions are original approximations of the public description, not measured