Film Rebate

The "rebate" is the dead space around a film frame - the sprocket holes, the edge numbers, the notch code on a 4x5 sheet, the white frame of a Polaroid. It's the detail that makes a flat digital image read as a scan of something physical, and almost nobody bothers to fake it properly. Film Rebate is Darkroom's node for that job, and it's a lot more than a white rectangle border.

It's procedural and format-correct: seven formats in one dropdown - 135 full frame, the 135 "filed carrier" look, 120 6x6 and 6x9, 4x5 sheet, Polaroid, and 35mm slide mount. Every dimension is computed from real millimeters, so it's resolution-independent by construction: run it at 512 or 4096 and the sprocket geometry stays proportionally correct.

How it works. The node composes your image into a larger film/print canvas (it extends the canvas, it doesn't crop), then draws the format's hardware around it. Two choices shape the whole output. format picks the geometry. film_type sets the rebate polarity - Color neg, B&W neg, or Reversal - which drives the border color; Polaroid and Slide use their own surface colors instead. Then compose decides how your image meets the aperture: fill cover-crops it in (the default), fit letterboxes it with rebate-color bars.

The details are where it gets fun. 135 full frame gives you KS-1870 perforations, the classic dual frame-numbering, and an optional stylized DX barcode (dx_barcode, plausible but not decodable - it's the look, not a real code). The filed carrier format is the Cartier-Bresson full-negative look: a seeded, jagged black border you can shape with border_width, roughness and paper_margin. 4x5 sheet prints an F-3-style notch code selected by stock name. And Polaroid - the author claims the dims were re-verified against Polaroid's own support figures, which is exactly the kind of obsessive detail the rest of this pack has.

Inputs you'll actually set:

• format - the big one. Everything else is fine-tuning once you pick the frame.
• compose - fill vs fit for the aspect mismatch between your image and the format aperture.
• frame_number - the first frame's edge-print number (135/120). Pair it with increment_per_frame and a batch becomes a contact sheet with numbers counting up.
• stock_name - drives the edge print, the 4x5 notch pattern, and the slide-mount color. Defaults to "AKURATE 400".
• seed - seeds the filed-carrier perimeter noise and the DX barcode pattern.

Outputs. image, and image_area - a MASK of where your photo actually landed inside the border. That's the piece you want for compositing: darken or blur everything outside it to kill the "this is a rendered image pasted on a background" look, or feed it to an inpaint. On a slide mount, date_text stamps red-ish ink like "MAY 74" across the mount, which is absurd and I love it.

Install. ComfyUI Manager, search "Darkroom", or:

cd ComfyUI/custom_nodes/
git clone https://github.com/jeremieLouvaert/ComfyUI-Darkroom.git
pip install -r ComfyUI-Darkroom/requirements.txt

Restart and it's under AKURATE/Darkroom/Film. Only scipy and opensimplex required, no models, no keys. One note: background (the small scanner-surround margin outside the film edge) defaults to black - set it to white if you're faking a flatbed scan rather than a dark slide scan. The Polaroid format especially looks wrong against a black surround.