Four Photoshop-style raster effects on the pixel-filter pipeline
(vectorcraft_effects::pixel::pixelate), under a new Effect › Pixelate
submenu between Blur and Sharpen in the Raster Effects section:
- Color Halftone (maxRadius 4..127, default 8; channel1..channel4 screen
angles -360..360, defaults 108/162/90/45): each colour channel is
screened at its angle in square cells sized so a dot of Max. Radius
fills one; each cell's dot covers the share of the cell that is the
channel's coverage-weighted mean there (white stays white, black
black). RGB documents screen R, G, B (channels 1 to 3); CMYK documents
screen C, M, Y, K inks (channels 1 to 4), also when they are drawn ink
plane by ink plane (the K plane uses channel 4).
- Crystallize (cellSize 3..300, default 10): every pixel takes the
colour at the nearest of one jittered point per cell (exact Voronoi
over a 5 x 5 neighbourhood, pruned by distance).
- Mezzotint (type: Fine/Medium/Grainy/Coarse Dots, Short/Medium/Long
Lines, Short/Medium/Long Strokes; default Fine Dots; a dropdown in the
dialog): each channel is turned fully on or off against its own random
threshold pattern, so the object becomes pure colours.
- Pointillize (cellSize 3..300, default 5): one dot of random size per
cell at a jittered point, coloured by the softened object there and as
opaque as the object at its centre, stacked in random order over a
white canvas where the object is.
Lengths are in points (Scale Strokes & Effects scales them) and every
pattern lies in document space around the object's centre, so the
result is the same at any zoom or raster resolution, moves with the
object, and is identical on every redraw (hash noise of the pattern's
cell indices, no state). Work per pixel is bounded whatever the
parameters, which are clamped to their ranges and finite-checked; the
halftone's cell grid is capped by the raster's size and a screen finer
than 3 pixels leaves the image as it is (its average). PixelSpace gains
`channels` so the renderer tells the filters what the channels hold.
Catalogue rows with parameter docs, outsets and reaches for cropping,
menu entries, dialog labels (Max. Radius, Channel 1-4, Cell Size), the
Mezzotint Type dropdown, translations, and tests: parameters and
clamping, tone and coverage, CMYK inks, polygon crystals, pure-colour
mezzotints with ten distinct patterns, dots on a white canvas, the same
result at twice the resolution and when moved, the canvas, PDF and SVG
through the engine, the command sweep with junk parameters, the dialogs
and the menu.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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