Halftones 0.8.0

Spot-color / screenprint workflow release — smarter key plates, smarter build-up, and files that show what's in them.

New

• Per-color key knockout — keep the key plate's halftone dots and/or edge stroke off specific inks, so a flat brand color prints clean while the rest of the image keeps its key detail. The knockout follows the color's owned region (padded to swallow anti-aliased rims, vectorize deviation, and trap spread — no dotted fringe at the edges).
• Build-up now honors flat/halftone per layer — switching a build-up layer to halftone actually halftones it (it was silently forced flat before).
• Overprint reach for build-up — instead of flooding every lighter plate under the entire design, limit each lighter plate to a set distance past its own region. Full misregistration protection at real ink boundaries, far less ink everywhere else. Off = classic full overprint.
• Replace Image… (File menu) — swap the source image while keeping every setting (colors, key plate, transforms, output size, margins, mask). Reuse a finished separation setup on new art.
• Project previews in Finder & Open Recent — saved .halftones files embed a thumbnail of the processed print and use it as their Finder icon (no QuickLook extension, no code signing), and File → Open Recent shows each project's thumbnail.
• Key plate Max Dot slider (alongside Min Dot).

Improved

• Round circles from vectorization — vectorized flat edges now re-curve gentle boundaries through an interpolating spline, so a circle renders round even when the trace reduced it to facets — while genuine corners stay sharp, so angular art is untouched and no "Rounding" is needed.

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macOS (Apple Silicon), unsigned. On first launch, right-click the app → Open, or System Settings → Privacy & Security → Open Anyway. If you instead see "app is damaged," clear the browser-download quarantine flag with:
```
xattr -cr /Applications/Halftones.app
```