{
 "date": "2026-10-23",
 "filter": "sketch_line_drawing",
 "model": "runware:400@2",
 "prompt": "Clean contour tracing of the main subject only. Uniform thin black lines on a pure white background. Remove the background completely. Only outer contour and main inner edges, no shading, no hatching, no texture, no gray, no fill. Smooth, continuous, closed lines, high contrast, suitable for converting to a vector cutting file.",
 "how": "One run per photo, no retries or selection. Called the same Runware provider and model as the production sketch filter directly (not through the Web API). Resized to fit 1024px and saved as WebP; no other edits.",
 "items": [
  {
   "source_file": "street_cat.webp",
   "source": "Unsplash photo https://unsplash.com/photos/R1oSj2m-7Ks (Unsplash License, no attribution required)",
   "source_sha256": "f4e2ae28bf5926f86ca7112aa7af29920c7f585e945694b4abeb28fe5b00a242",
   "result_file": "street_cat-sketch_line_drawing.webp",
   "result_size": [
    683,
    1024
   ],
   "result_sha256": "956988e6f2ebe6ff40a07af5853dad10bfe1a1973fc658b2326c806af5abef06",
   "raw_output_sha256": "f1eac0fc8fa148b0d389edcbe508bdf1eee73d149c5463c6867c755a22f04b15",
   "elapsed_seconds": 13.22
  },
  {
   "source_file": "person.webp",
   "source": "AI-generated cafe image; provenance: /images/examples/cafe/evidence.json",
   "source_sha256": "e44eb48f925b363f89de1a9755822e4be46a683cfc4bfb0865337ad02741ed74",
   "result_file": "person-sketch_line_drawing.webp",
   "result_size": [
    820,
    1024
   ],
   "result_sha256": "2684fa0be51c94ddf3852b82881019a275e77049e8b125196437eb277821a58f",
   "raw_output_sha256": "fba0c151a0cf32cf136ca40fbf9abd17b6280d1046f2e12fc8eaba24ed88edad",
   "elapsed_seconds": 4.54
  },
  {
   "source_file": "husky.webp",
   "source": "Unsplash photo https://unsplash.com/photos/7h7QEvfw3Pg (Unsplash License, no attribution required)",
   "source_sha256": "8c4ea0a828974d8b2476331d247af0cd19afd538b8df6bddfaaebd37848177e0",
   "result_file": "husky-sketch_line_drawing.webp",
   "result_size": [
    768,
    1024
   ],
   "result_sha256": "5fb0c8e62501e494aa55684c5e1273258bb3832e7eb42c003758a8ac79695b25",
   "raw_output_sha256": "3c1d4394bf2ea4218b66f0d798e48b09c39820f8c4577bcf614ace5110331cf1",
   "elapsed_seconds": 10.28
  }
 ]
}