From 63616b7db74865aa07454c705f85557303d11e71 Mon Sep 17 00:00:00 2001 From: dotCooCoo Date: Tue, 20 Oct 2026 21:17:59 -0700 Subject: [PATCH] Docs: the Image Trace page describes the background line between Abutting colors With Method Abutting, neighboring colors share one exact edge. The canvas smooths each path's edges on its own, so each path covers only part of the pixels along that edge, and a thin line of the background can show between the colors. The adjustments page did not say so. It now describes the line, names the default and the presets that use Abutting (Default, Auto Color, 3 Colors, 6 Colors and 16 Colors), says which exports show it (SVG and PDF in most viewers; raster exports with Type Optimized, or with Art Optimized above 10 million pixels or 16,384 pixels on a side), and points to Overlapping, which stacks the colors and shows no background along shared edges. --- docs/image-trace-adjustments.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/docs/image-trace-adjustments.md b/docs/image-trace-adjustments.md index 17dbaef28..55b9ad4db 100644 --- a/docs/image-trace-adjustments.md +++ b/docs/image-trace-adjustments.md @@ -32,6 +32,18 @@ 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)). +**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 +pixels along that edge, and a thin line of the background can show between the colors. Web browsers +and PDF viewers usually draw an exported SVG or PDF file the same way and show the same line. Raster +exports (PNG, JPEG, TIFF and the other bitmap formats) with None anti-aliasing do not show it at any +size. Raster exports with Art Optimized anti-aliasing, the default, do not show it up to 10 million +pixels and 16,384 pixels on a side. A raster export shows the line as the canvas does when it uses +Type Optimized anti-aliasing, or when it uses Art Optimized and is larger than either limit. +Overlapping stacks the colors instead: a lower color continues under the edge of the color above it, +and no background shows along that edge. + **Large images.** An image of more than 1500 pixels on a side is traced as any other, only more slowly, and the trace says so: `imageTrace.make` returns the note in `warnings` and the status bar shows it (the [results optimization](https://helpx.adobe.com/illustrator/using/image-trace-results-optimization.html)