Call the reference curve what it is, and drop wording that reads as copying

The view transform's second curve is the DNG SDK's published reference
rendering — the ACR3 default curve applied by RefBaselineRGBTone — so
it is the "DNG Reference" curve in the panel, D21 and the code, not a
name borrowed from another product. Comments and docs that justified a
choice by another editor doing it ("as their Amount", "so a
photographer arriving from it finds the name") now give the actual
reason. The Vivid presets no longer describe themselves as reaching
for another editor's look; they are DarkRoom's own.

Factual mentions stay: which program wrote the library's DNGs, what
was measured against, and preset import. camera-profiles.md gains §15,
on starting a photograph from the edit it already carries.

core/dr-pipeline/src/ops/camera_profile.rs

@@ -48,7 +48,7 @@ pub const LOOK: ParamId = ParamId("look");
 /// The look's strength at which the LookTable is applied as the profile
 /// states it, in percent.
 pub const DEFAULT_LOOK: f32 = 100.0;
-/// Twice the profile's look: Lightroom's *Amount* reaches the same.
+/// Twice the profile's look.
 pub const MAX_LOOK: f32 = 200.0;
 
 /// Entries of the buffer's header, before the entries themselves: one
@@ -130,7 +130,7 @@ fn wgsl_mat(m: &[f32; 9]) -> String {
 
 /// The working space to ProPhoto and back, as WGSL constants, and where
 /// the profile buffer's sections begin. A helper of its own because the
-/// view transform's Camera Raw curve needs it too, and helpers are emitted
+/// view transform's DNG reference curve needs it too, and helpers are emitted
 /// once each, in the order first asked for.
 pub(crate) static PROPHOTO_HELPER: LazyLock<Helper> = LazyLock::new(|| {
     let (to, back) = working_prophoto();
@@ -390,7 +390,7 @@ if (hue_sat_dims.x > 0.0 || look_dims.x > 0.0) {
 /// The curve is always there: the profile's own where it has one, Camera
 /// Raw's ACR3 default otherwise — including in the placeholder every source
 /// without a profile binds, whose tables are absent, so a raw with no
-/// profile still renders through Camera Raw's tone (D21).
+/// profile still has the reference tone curve when it is chosen (D21).
 pub fn profile_buffer(tables: Option<&ProfileTables>) -> Vec<[f32; 4]> {
     let header = |t: Option<&HueSatTable>| match t {
         Some(t) => [
@@ -706,7 +706,7 @@ mod tests {
     fn the_buffer_puts_the_header_first_and_the_look_after_the_hue_sat_map() {
         let bare = profile_buffer(None);
         assert_eq!(bare[..2], [[0.0; 4]; 2], "no tables");
-        assert_eq!(bare[2][0], 1025.0, "and Camera Raw's default curve");
+        assert_eq!(bare[2][0], 1025.0, "and the reference default curve");
         assert_eq!(bare.len(), HEADER_ENTRIES + 1025);
         let t = tables(
             Some(uniform(2, 2, 1, [1.0, 2.0, 3.0])),

core/dr-pipeline/src/ops/view_transform.rs

@@ -36,7 +36,7 @@ pub const WHITE: ParamId = ParamId("white");
 /// TRACES: FR-DEV-3j
 /// Which curve renders: D19's sigmoid (index 0, the default) or Camera
 /// Raw's (D21). Which of the two should be the default is open — the
-/// Lightroom-matching work decides it — so the default is what 0.20.0
+/// measurement work decides it — so the default is what 0.20.0
 /// rendered.
 pub const CURVE: ParamId = ParamId("curve");
 
@@ -161,7 +161,7 @@ impl Operation for ViewTransform {
         "\
 // Skipped for an already-rendered source: a JPEG is a display rendering
 // already, and rendering it again would compress it twice.
-// D19's sigmoid by default, Camera Raw's tone by choice (D21).
+// D19's sigmoid by default, the DNG reference tone by choice (D21).
 if (!non_linear) {
     if (mode > 0.5) {
         c = camera_raw_tone(c, cr_scale, cr_power, cr_grey);