# Border textures `film.png` and `LICENSE-film-borders` are copied unchanged from https://github.com/romnn/film-borders at commit `ff428ce31dfc77701941d4cdbd45734dac5976a6` (MIT, copyright romnn). It is upstream's built-in 120-film border: an opaque black frame with an irregular inner edge and a few translucent dust specks, transparent elsewhere. `spektrafilm-io::border` stretches it over the photograph as a nine-patch, and the macOS preview does the same with Core Animation. ## 35mm The 35mm border is a strip of 135 film: ISO 1007 perforations, the stock's edge print, a DX or KeyKode barcode and frame numbers. `spektrafilm-io::film35` draws it at the resolution of each export, so it stays sharp on a 60 MP photograph. The edge print for each stock is a table in that module. `35mm/material.png` holds what a drawing can't invent: the dust, specks and uneven base density of a real negative. Its grey channel is dust (density over the base, 0–255). Its alpha channel is the base's slow density variation, 128 ± 500 × density. It covers one 38 mm frame at 125 px/mm in strip coordinates, and is extracted, with the original edge print removed, by `cargo run --release -p spektrafilm-io --example film35_material -- SCAN.jpg data 5` from: > "135 film. Konica VX 10. DX encoding" by Dmitry Makeev, CC BY-SA 4.0, > https://commons.wikimedia.org/wiki/File:135_film._Konica_VX_10._DX_encoding.jpg `material.png`, and the strips rendered from it, are therefore licensed CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), with that attribution. `35mm/full/.png` (36 × 24 mm frames, for 3:2 photographs) and `35mm/half/.png` (18 × 24 mm half-frames, for 3:4 photographs) are the same strips at 100 px/mm, without grain, for the macOS preview. Films without an edge print use `generic.png`. Regenerate them, and `35mm/frames.json` (the gate as fractions `[x, y, width, height]` of the strip), after changing the renderer or the material: cargo run --release -p spektrafilm-io --example film35_borders Tri-X 400 (`kodak_trix400_d76_8min`) uses the generated stock label `KODAK 400TX`, with the B&W rebate and ink colours. Both preview formats are generated by the same stock table as the export renderer. This identifies the camera stock; the D-76 processing recipe is not printed on the film. The lettering is a reconstruction over the shared scanned material, not a new stock-specific 400TX border scan. Tri-X 7266 reversal remains generic. The edge print uses Barlow Condensed (SIL OFL, in `crates/spektrafilm-io/fonts`).