nx_silhouette.nx

nx_silhouette.nx -- ★★★PHOTO -> OUTLINE PROFILE: the missing link between a reference figure and a number. WHY THIS EXISTS. The curvature metric reads 3D geometry, so a photograph -- which is what every reference figure actually is -- could not be measured at all. That left "aim at this figure" as an instruction with no arithmetic behind it. This organ closes that: a photo becomes a half-width profile, and the profile goes into the SAME curvature measurement the meshes use. ★★ONE CURVATURE IMPLEMENTATION, TWO SOURCES. This organ deliberately does NOT compute curvature. It emits a profile; nx_curvebench measures it. A second copy of the metric living here is how a photo target and a mesh score would quietly drift onto different scales and stop being comparable -- which would defeat the entire point of extracting an aim point in the first place. ★★AND IT IS THE SAME PIECE THE TWIN LOOP NEEDS. Registration (bringing a subject and the model into one frame) starts from exactly this: the subject's outline. So the beauty lane and the capture ladder turn out to want one capability, which is the second time in this programme that two goals have collapsed into one rung. SEGMENTATION: skin classified in CHROMA, not in brightness. The classic robust rule -- skin occupies a compact region in Cb/Cr almost independently of lightness -- which is why it survives the hard sun-and-shade mixtures in outdoor reference photography where a brightness threshold would cut the figure in half at the shadow line. ★HONEST SCOPE, stated because it decides where this may be pointed: this works on a figure against a non-skin background. It is not a general matting solution, it will fail on skin-toned backgrounds, sand, and tanned wood, and T3 exists to prove it at least REFUSES rather than inventing a body. nx_silhouette profile <image> <out.prof> [bands] -> half-width profile + coverage nx_silhouette selftest license_tier: ORIGINAL expect_exit: 0 No hw writes (Rule 26).