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An image's own fill or stroke with Outline Object now follows the outline of the image's pixels that are at least 50% opaque, traced from the alpha and fitted with curves, instead of the image's frame. An image without transparency, one whose pixels can't be read, one of more than 64 megapixels or whose decoded pixels take more than 256 MB, and one whose outline would need more than 100,000 anchor points keep the frame. An image with no pixel at least half opaque gives nothing to paint. Images of more than 4 megapixels are traced from their alpha averaged down to 4 megapixels, and an averaged pixel that covers a pixel at least half opaque stays at least half opaque, so thin opaque lines stay in the outline. Each outline is traced once for its pixels, kept for the next redraw while those pixels are loaded, and dropped after them; a second thread that needs the same outline waits for the trace. - vectorcraft-trace: `decode_alpha` reads an image's alpha, and `opaque_outline` traces it as Black and White mode at threshold 128. - vectorcraft-effects: the reshaped image art uses it for rows whose first effect is Outline Object; Convert to Shape rows keep the frame. - Docs: docs/mcp.md, the Outline Object params text and an evidence line in docs/target-app-parity.md. docs/mcp.md also says that Use Preview Bounds takes in the shapes an image's fills and strokes paint.