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vangel76andClaude Opus 5.5
50cbbfe310
With Matte Only on, Cryptomatte wrote the matte into all four channels: a premultiplied white only as opaque as the matte. After Effects' Cryptomatte plug-in shows Matte Only as an opaque grey picture, the matte in RGB with alpha 1 (its Matte Only render of 2026-11-05 is opaque black where nothing is selected). The CPU effect and the GPU shader now both give (m, m, m, 1). Projects saved before keep their render: a hidden Matte Only In Alpha switch (off for new instances, presets and AEP imports) is turned on by migrate::legacy_default when an older instance is upgraded on open, and then keeps the matte in every channel on CPU and GPU. Tests: the CPU path for a partly covered pixel, an unselected one and outside the aux area, in both forms; the upgrade of a saved instance; the GPU parity test over every display with Matte Only off, on and on with the legacy switch; the host pick tests read whole pixels. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>