dtourolle
657f8f19ff
A film stock ran at order 25, after white balance and exposure, and everything after it — contrast, the curves, the colour mixer, the grading, every mask layer's tone — acted on the film's display-referred output, as though the frame had been scanned and then worked on. That was a display-referred rendering in the middle of the chain, which D19 removes (FR-DEV-3f, FR-DEV-3j). `film_sim` is now in `Stage::View` beside `view_transform`. While a stock is loaded the composer emits it in the view transform's place and not the sigmoid; otherwise the sigmoid. So every edit is a decision about the exposure the negative receives, and the film is the last thing that happens to the picture — after the detail stage too, in the view pass, which already binds the film's tables, the mask array and the grain's source position. Its per-layer settings blend there as they did in the fused pass. `op_renders` goes: a rendering is chosen, not suppressed, and the only render with no view transform is the camera-space tap. The YAML order moves to 190 so the panel reads in pipeline order; the stage, not the number, is what places it. Existing edits that combine a stock with tone or colour operations now render differently: those operations used to act on the print, and now act on the scene.
28 lines
1.4 KiB
YAML
28 lines
1.4 KiB
YAML
id: film_sim
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order: 190
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# What this node is *about* is not written here, and cannot be: a `rust:` node
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# publishes its own descriptor, so `attributes:` in this file would be read,
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# validated and then ignored. See `Attribute::Effect` on `FilmSim`'s descriptor
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# in `../src/ops/film_sim.rs`.
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rust: FilmSim
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why_rust: |
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It carries a stock's measured tables — an exposure matrix, three
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characteristic curves and a density lookup — which are not parameters and
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which no `uniforms:` expression could produce. Its neutral is "no stock
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loaded" rather than a set of values, and it is the one node that declares
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`Operation::renders`, so the composer omits the camera profile's base curve
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and the conversion out of camera space on its behalf.
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placement: |
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Last, in the view transform's place (D19, FR-DEV-3j), after every other
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operation and after the detail stage.
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Before D19 it sat at order 25, after white balance and exposure, and every
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decision below it acted on the film's output, as though the frame had been
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scanned and then worked on. That put a display-referred rendering in the
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middle of the chain, which is what D19 removes: every operation is now handed
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the scene, and the film is the last thing that happens to the picture — an
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edit is a decision about the exposure the negative receives. `Stage::View`
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is what puts it there; this number only places it in the panel's order.
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