dtourolle
97d4bd9061
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.
37 lines
1.6 KiB
YAML
37 lines
1.6 KiB
YAML
# A hand-written node. `rust:` names the type in `crate::ops` that implements
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# `Operation`; its descriptor, its parameters and its passes come from that
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# type rather than from this file. It appears here anyway because `ops/` is
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# where the pipeline's order is written down, and an order kept half in YAML
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# and half in Rust would be worse than either alone.
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id: clarity
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order: 120
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attributes: [detail]
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rust: Clarity
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why_rust: |
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A neighbourhood operation. Clarity is defined by what the pixels around a
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pixel are doing, and the schema above describes a function of one colour —
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`wgsl:` is handed `c` and no coordinate, which is the wall the detail stage
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exists on the other side of. It declares `Affects::Detail` and returns two
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`DetailPass`es: a Gaussian of log luminance along each axis, the second of
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which also applies the mask.
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A kernel is also not four facts. Stretching this schema to express a
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truncation rule, a soft limit and a midtone taper would produce a worse
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language than Rust, aimed at one caller.
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placement: |
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In the detail group, after noise reduction and before sharpening.
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Order inside the group is not arbitrary. Clarity multiplies local contrast,
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so it multiplies noise with it — running it before noise reduction would ask
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the denoiser to remove grain that clarity had already amplified into
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structure. And capture sharpening belongs last, on the picture as it will
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finally be, so that the acutance a photographer judges at 1:1 is the acutance
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in the file.
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Before texture, which is a decade finer: coarse before fine, so the fine
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control's base is computed on the modelling the coarse one has already
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settled.
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