dtourolle
8ea427de3c
Checkpoint committed by the coordinator, not by the authoring agent: the session hit its API limit mid-task and left this work uncommitted. Committed so it survives, NOT because it is finished - expect failing tests and half-applied changes. The agent resumes from here.
34 lines
1.6 KiB
YAML
34 lines
1.6 KiB
YAML
# A hand-written node, and a neighbourhood one: it reads the pixels around the
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# one it is writing, so it runs in the detail stage rather than as a fragment
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# in the fused pass. See `../src/detail.rs` for why that stage exists and
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# `README.md`'s "Nodes that read their neighbours" for the contract.
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#
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# As with every `rust:` node, its descriptor, parameters and behaviour come
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# from the type; this file exists so that `ops/` remains the one place the
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# pipeline's order is written down.
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id: capture_sharpen
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order: 110
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attributes: [detail]
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rust: CaptureSharpen
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why_rust: |
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A convolution, not a point function. The schema in `README.md` describes an
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operation handed a colour with no way back to a coordinate, which is exactly
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what a kernel cannot work with — and stretching it to cover taps, kernel
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extents and a per-render conversion from source pixels to render pixels
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would produce a worse language than Rust aimed at one caller.
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placement: |
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First among the detail nodes, because capture sharpening is a correction to
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the capture: it recovers the acutance the anti-aliasing filter, the lens's
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circle of confusion and the demosaic interpolation each took out, and it is
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meaningful before any effect built on top of it. The compositional detail
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controls — texture, clarity — reasonably follow it, since they are about the
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picture rather than about the sensor.
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Being in the detail group at all is what places it after every tonal and
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chromatic operation: an amount tuned before a tone curve is amplified by
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whatever slope that curve happens to have, so the amount that looked right
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stops looking right the moment the curve moves.
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