Added the delta-tooling

readme.md

@@ -150,6 +150,16 @@ camera C1, into `gallery/` with `--pretty`, skipping any whose model or data
 is missing, and `scripts/serve-gallery.py` serves the result as a web page on
 port 8000 of every interface, each scene captioned from its file.
 
+`scripts/gallery-delta.py` shows what a change did to the images: it renders
+the example scenes at two revisions, noiseless, and the gallery's Delta tab
+shows each changed image before, after, and with its changed pixels colored
+(orange brighter, blue darker), with the change in DN. With no arguments it
+compares HEAD with uncommitted changes, or HEAD~1 with HEAD when there are
+none; `--base` and `--head` pick others. Each commit is built in a git worktree
+under `target/delta/` and its renders are kept, so comparing the next commit
+reuses them. About 40 s on the RTX 3060 once built; it needs numpy, Pillow and
+ImageMagick.
+
 `crates/resolved-showcase` makes a 30-second movie at lighting L1 and camera
 C1: an inspector holding station behind a Landsat 8 model 705 km up, which
 astrokit propagates with J2. Time runs fast over the daylit Earth, slows as
@@ -189,7 +199,9 @@ cargo run --release -p resolved-showcase -- --serve 0.0.0.0:8010
   2 x 2). A tier the scene or the data cannot support stops with an error naming
   what is missing.
 - `--seed N` and `--frame N` pick the detector noise at camera C1 (default 0
-  and 0): the same seed and frame give the same image.
+  and 0): the same seed and frame give the same image. `--noiseless` leaves out
+  the noise, dark current and fixed pattern, so two renders differ only where
+  their light does.
 - `--data DIR` says where the tiers' data is (`earth/bmng-2004-MM.jpg`,
   `moon/wac-hapke-643.png` and `stars/stars.bin`).
   Without it the CLI tries `RESOLVED_DATA`, then `./data`, then the