Smart Blur's Edge Only and Overlay Edge modes marked a pixel when one
of its four nearest pixels differed from it by more than Threshold,
and Radius changed only the blur. The reference app's documentation
says that Radius sets the size of the area searched for dissimilar
pixels.
A pixel is now on an edge when one of the pixels the search reads
within Radius differs from it by more than Threshold and its
channels, alpha included, add up to at least that pixel's. The search
picks its neighbors as the Normal blur does, over the whole pixels of
Radius and within it, and always reads the four nearest pixels.
A color step gives a line about as wide as Radius on the side with
the larger sum, and a Radius of one pixel or less gives the same
edges as before. The edge modes' reach() includes the blurred copy
that a wide Radius reads.
On a 2,000 by 2,000 px image, Edge Only takes 0.49 s at Radius 10 and
0.34 s at Radius 100, and Normal takes 0.73 s and 0.39 s. Normal
draws the same pixels as before.
Docs: docs/target-app-parity.md.
Effect › Blur › Smart Blur had only its Normal mode: the dialog and
blur.smart took Radius, Threshold and Quality and drew the blur.
Smart Blur now takes a `blurMode` param ("normal", "edgeOnly" or
"overlayEdge"; "normal" by default), which its dialog shows as a Mode
menu. Edge Only draws the edges in white on black, and Overlay Edge
draws them in white over the Normal blur. A pixel is on an edge when
one of its four nearest pixels differs from it by more than the
threshold in a channel and its channels, alpha included, add up to at
least that pixel's. The white and the black keep each pixel's
coverage. Normal draws the same pixels as before, and an effect saved
without `blurMode` draws as Normal.
Docs: docs/effects-parity.md, docs/gaps.md, docs/target-app-parity.md.
Effect › Blur › Radial Blur (spin/zoom, draft/good/best) and Smart Blur
(Normal mode), Effect › Sharpen › Unsharp Mask: Photoshop-style filters in
vectorcraft_effects::pixel, run by the renderer on the object's pixels in
stack order with Gaussian Blur and Feather, cached while panning; lengths in
points, bounded work per pixel. PDF, Expand Appearance and SVG export write
the effected objects as images. Dialogs with preview (method/quality
dropdowns, fields in documented order), menu entries, translations, tests.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
dotCooCoo