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feat(color): minimal cross-codec CICP/ICC emission policy #19

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feat(color): minimal cross-codec CICP/ICC emission policy #19

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10 changes: 10 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -8,6 +8,16 @@ All notable changes to zencodec are documented here.

### Added

- **Color-signaling production policy** (`zencodec::color`) — `resolve_color_emit`
reconciles a `SourceColor` against a target's `EncodeCapabilities` under a
`ColorPolicy` (`Compatibility`/`Balanced`/`Compact`/`Verbatim`/`Custom`) and
returns a `ColorPlan { cicp, icc: IccDisposition }`: derive CICP from an ICC and
drop the redundant profile only where CICP is the format's authority and safe
as the sole carrier (`EncodeCapabilities::{cicp_is_format_authority,
cicp_safe_sole_carrier}` — JXL today), else keep/synthesize the ICC; grayscale
and CMYK suppress CICP. `IccRetention` gains `DropIfCicpRepresentable` /
`DropIfCicpSafeSoleCarrier`. Deliberately minimal surface (HDR/gain-map
dispositions + warnings notes deferred; `ColorPlan` is `#[non_exhaustive]`).
- **Field-level metadata retention** — `Metadata::filtered(&MetadataPolicy)`,
the shared filter for re-encode / recompress pipelines: keep what a
downstream image needs, strip the rest, without callers hand-parsing EXIF.
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