Render retained foreground contrast filters - #473
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This was referenced Sep 18, 2026
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Closes #471. Parent: #256.
WebScene now emits single-function
filter: contrast(<number-or-percentage>)as a balanced retained foreground-filter group and applies the same centered RGB contrast matrix in Avalonia/Uno and Flutter. The slice reserves kind-30 bit 29, carries a bounded 0–10 multiplier instroke_width, and preserves opacity, brightness, and grayscale encodings.Implementation-only tranche: tests, builds, browser/native pixel contracts, performance and lifecycle benchmarks, hosted checks, CI monitoring, and exact-package visual acceptance were skipped and remain validation debt under #241/#256.