From 090293db4ebd3b66f3a28d2c1fef9fe05dcec00e Mon Sep 17 00:00:00 2001 From: dotCooCoo Date: Fri, 13 Nov 2026 21:22:12 -0800 Subject: [PATCH] Image Trace: preset docs name the enhanced versions and older figures The preset paragraphs say that the enhanced versions use the same Paths, Corners and Noise, and that Corners 50 applies to the other eight presets. The quality notes add the staircase and anchor rises in Line Art, Outline, 3 Colors, Sketched Art and Silhouettes, and say which figures were measured at the earlier values. The anchor-limit comments name the same settings in both places. --- crates/engine/src/cmd/buildcmds/trace.rs | 12 ++++++------ docs/image-trace-adjustments.md | 6 +++--- docs/image-trace-quality.md | 12 ++++++++---- docs/target-app-parity.md | 2 +- 4 files changed, 18 insertions(+), 14 deletions(-) diff --git a/crates/engine/src/cmd/buildcmds/trace.rs b/crates/engine/src/cmd/buildcmds/trace.rs index 024ae851f5..0a03ab00b1 100644 --- a/crates/engine/src/cmd/buildcmds/trace.rs +++ b/crates/engine/src/cmd/buildcmds/trace.rs @@ -288,10 +288,10 @@ fn trace_library(c: &str, s: &Session, params: &mut tr::TraceParams) -> Result= 2_000_000 && MAX_TRACE_ANCHORS <= 16_000_000); } diff --git a/docs/image-trace-adjustments.md b/docs/image-trace-adjustments.md index e35fe5453b..2c9889f5de 100644 --- a/docs/image-trace-adjustments.md +++ b/docs/image-trace-adjustments.md @@ -18,9 +18,9 @@ its current location. Opening the controls does not add a document undo step. | Create | Fills / Strokes | Creates filled areas, stroked lines, or both. | | Ignore Color | Color picker | Leaves out the selected color (white by default). | -The built-in presets other than Auto Color and Flat Logo all use Paths 50. Corners is 100 in -Technical Drawing, 75 in Default, Black and White Logo, Line Art and Outline, and 50 in the others. -Noise is 1 px in Technical Drawing, 5 in High Fidelity Photo, 10 in Low Fidelity Photo, 15 in 3 Colors, +The built-in presets other than Auto Color and Flat Logo all use Paths 50, and so do their enhanced +versions. Among those presets, Corners is 100 in Technical Drawing, 75 in Default, Black and White +Logo, Line Art and Outline, and 50 in the other eight. Noise is 1 px in Technical Drawing, 5 in High Fidelity Photo, 10 in Low Fidelity Photo, 15 in 3 Colors, 6 Colors, 16 Colors and Shades of Gray, 20 in Sketched Art, Line Art and Outline, 25 in Default and Black and White Logo, and 90 in Silhouettes (see [image-trace-quality.md](image-trace-quality.md#preset-paths-corners-and-noise)). diff --git a/docs/image-trace-quality.md b/docs/image-trace-quality.md index 0c18767785..41262be69c 100644 --- a/docs/image-trace-quality.md +++ b/docs/image-trace-quality.md @@ -247,7 +247,8 @@ Every built-in preset other than Auto Color and Flat Logo traces at Paths 50. Co | Technical Drawing | 50 | 100 | 1 | 95, 90, 4 | | Outline | 50 | 75 | 20 | 80, 70, 10 | -The palettes, color counts, thresholds and other options of the presets did not change. +The palettes, color counts, thresholds and other options of the presets did not change. The enhanced +versions of these presets use the same Paths, Corners and Noise. Measured with the harness below (section 1, each preset on the inputs it is meant for), before and after: anchors fall in 10 of the 12 changed presets, for example 5,494 to 3,136 (High Fidelity Photo), 33 to 27 @@ -255,14 +256,17 @@ anchors fall in 10 of the 12 changed presets, for example 5,494 to 3,136 (High F Sketched Art does not change. Outlines on flat art lie further from the true edge: off mean 0.100 to 0.123 px (16 Colors), 0.101 to 0.119 (6 Colors), 0.104 to 0.129 (3 Colors), 0.064 to 0.092 (Black and White Logo) and 0.056 to 0.074 (Line Art), and off max 1.00 to 1.16 px in 6 Colors and 16 Colors. Technical Drawing -leaves 1.4 specks (was 0.5), and Outline's stroked centre lines lie 0.095 px off (was 0.086) with 2.7 +leaves 1.4 specks (was 0.5), and Outline's stroked center lines lie 0.095 px off (was 0.086) with 2.7 anchors a stroke (was 3.0). ΔE changes by 0.01 or less except Line Art and Outline (2.62 and 2.61 to 2.66 and 2.67); edge ΔE rises in 8 of the 12, for example 4.79 to 5.25 (16 Colors), 3.98 to 4.46 (3 Colors) and 9.46 to 10.03 (Black and White Logo). On synthetic shapes and photos of 300 to 4,000 px traced outside this harness, High Fidelity Photo makes 41% fewer anchors and 16 Colors 20% fewer; the mean pixel difference of each trace changes by −0.23 to +0.26 of a level; 16 Colors leaves 41 staircases of steps of 2 px or more where it left 40, High -Fidelity Photo 440 where it left 391, and Low Fidelity Photo 96 where it left 77. The tables below are the previous -measurement, not a rerun. +Fidelity Photo 440 where it left 391, Low Fidelity Photo 96 where it left 77, Line Art 17 where it left 13, Outline 13 +where it left 10 and 3 Colors 14 where it left 12. On the same images Sketched Art makes 4,084 anchors where it made +3,936 and Silhouettes 1,608 where it made 1,578. The figures for these twelve presets and their enhanced versions in +the other sections of this file, and in the Image Trace entries of +[target-app-parity.md](target-app-parity.md), were measured at the earlier values. Test: `presets_have_their_paths_corners_and_noise` in `crates/trace/src/tests.rs`. ## A simpler contour walk diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md index b59be1312b..529faa455f 100644 --- a/docs/target-app-parity.md +++ b/docs/target-app-parity.md @@ -1418,7 +1418,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur - **Image Trace, cut-out edges:** in Color and Grayscale, a semi-transparent pixel (alpha 128 to 254) on the edge of a cut-out image, beside a pixel that is less than half opaque, traces as a color of the fully opaque pixels within two pixels of it when its own color is that color or a darker shade of it, and of several such colors, as the one the most of those pixels have (art across a transparent gap does not count), so a darkened edge tone no longer traces as a 1 px sliver of an unrelated palette color, while a thin semi-transparent outline of another color keeps its own; code-drawn cut-out, opaque-edge and thin-outline tests in `crates/trace`. - **Image Trace, cut-out edges choose no color:** in Color and Grayscale, the edge pixels that take the color beside them, and the semi-transparent pixels within two pixels of them whose color is also the opaque art's color blended with the background, do not count when the palette or the grays are chosen, so the edge of a cut-out image no longer adds a second shade of a color to Auto Color's palette, takes away an outline's color or takes a gray of its own; beside those pixels, the anti-aliasing between a color and an outline drawn along the edge is no color of Auto Color's own when it lies at least 0.45 of the way from the color to the outline and at least one in 32 of its pixels has both around it (edge pixels that choose no color count when they lie within 2.5 Oklab × 100 of the nearest of those colors): its pixels trace as the outline, so a thin outline stays a ring of few pieces, except beside an outline along the edge with a region of 8 pixels of its own, where each takes the nearer of the two, so a wider outline is not drawn wider; an outline over the edge in the color of other art traces in that color, while an opaque rim drawn along the edge keeps its color, also where other art reaches it; a thin semi-transparent outline of another color still counts, and opaque images trace as before; code-drawn cut-out outline, rim, opaque line and grayscale edge tests in `crates/trace`. - **Image Trace, blurred edges:** in Color with a Limited palette of at most 16 colors (3 Colors, 6 Colors, 16 Colors) and in Grayscale with at most 16 grays (Shades of Gray), by VectorCraft's own rule (RGB distances, 0 to 255 a channel), a blend pixel with no unblended pixel of its own color within 4 pixels takes the nearer side of the pair of colors within 8 pixels that it is best a blend of, of the 8 colors within 8 pixels nearest to its color, when that pair explains it twice as well as its own color, or when it lies between the two and off the line between them by less than 0.15 of their distance apart; it keeps its color when it is one of the pair. Grayscale compares lightness. The in-between tones of an edge blurred over several pixels no longer trace as rings around it. High Fidelity Photo, Low Fidelity Photo and Black and White trace as before, and so do Automatic, Full Tone and Document Library palettes. Noisy and textured images settle more of their pixels. By `crates/trace/tests/quality` (256 px variants), 16 Colors on blurred flat art went from 9.0 paths to 3.0, 158 anchors to 34 and 0.239 px off to 0.069, and 6 Colors from 6.0 paths to 3.0 and 0.226 px off to 0.071; askew shapes take up to 11 px more area in colors the art does not have, and with 16 Colors the largest distance from a thin line's outline to the trace goes from 23.5 px to 45.3 (see [quality notes](image-trace-quality.md#blurred-edges)). Code-drawn blurred-disc and grayscale ramp tests in `crates/trace`. -- **Image Trace, preset Paths, Corners and Noise:** every built-in preset but Auto Color and Flat Logo traces at Paths 50; Corners is 100 in Technical Drawing, 75 in Default, Black and White Logo, Line Art and Outline and 50 in the others; Noise is 1 to 90 px by preset. Palettes and color counts are unchanged. By `crates/trace/tests/quality`, High Fidelity Photo goes from 5,494 anchors to 3,136 and Black and White Logo from 27 to 14, while 16 Colors on flat art goes from 0.100 px off to 0.123 (see [quality notes](image-trace-quality.md#preset-paths-corners-and-noise)). Test `presets_have_their_paths_corners_and_noise` in `crates/trace`. +- **Image Trace, preset Paths, Corners and Noise:** every built-in preset but Auto Color and Flat Logo traces at Paths 50, and so do their enhanced versions; among those presets, Corners is 100 in Technical Drawing, 75 in Default, Black and White Logo, Line Art and Outline and 50 in the other eight, and Noise is 1 to 90 px by preset. Palettes and color counts are unchanged. Figures for these presets in the other Image Trace entries were measured at the earlier values. By `crates/trace/tests/quality`, High Fidelity Photo goes from 5,494 anchors to 3,136 and Black and White Logo from 27 to 14, while 16 Colors on flat art goes from 0.100 px off to 0.123 (see [quality notes](image-trace-quality.md#preset-paths-corners-and-noise)). Test `presets_have_their_paths_corners_and_noise` in `crates/trace`. - **Image Trace, simpler contour walk:** `contour::trace_mask` works out each turn from the pixels during the walk, with no precomputed direction table and no assertion; identical loops to the previous walk on every 4 × 4 mask (see [quality notes](image-trace-quality.md#a-simpler-contour-walk)). - **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.