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Jp Valery

Oct 13, 2026

Introducing Monobath

I'm building Monobath, a Mac app that turns camera scans of film negatives into photos. It's in beta now.

Photograph by Jp Valery in June 2019

I shoot 35mm, 120 and 4×5 film, and I develop and scan it at home. For a while now, I've been building an app for the step after the scan: turning negatives into photos.

It's called Monobath. It's the converter I wanted for my own negatives: fast, private, and paid for once.

Negatives in. Photos out.

Drop in camera scans of your film. Monobath takes out the orange, finds the frame and hands back photos.

  • It works with colour negative, black and white negative and slide film.
  • It removes the orange film base and balances colour from the film itself.
  • It finds the frame, crops out the holder and the film edge, and levels tilted frames.
  • It has 14 tone profiles in three families: Darkroom, Neutral and Cinema. Each one is a tone curve fitted to each frame, and you can still adjust exposure, contrast, highlights, shadows and more.
  • You can copy settings from one frame to a selection, a folder or the whole library.
  • It reads camera RAW, TIFF and JPEG, and exports 16-bit TIFF or PNG, or JPEG, at full resolution in Display P3 or sRGB.

Private, and paid for once

Monobath points to your files. It doesn't copy, move or change them. Everything runs on your Mac, and nothing gets uploaded.

There's no subscription and no account: you buy it once. You can convert your first 6 photos in a library for free, with every tool and export format, before you decide.

Where it's at

Monobath is in beta on Mac. iPad and iPhone come next. Join the beta to hear when it opens and when early-bird pricing starts.

I'm also looking for film scans to test future releases with. If you'd like to send some, you'll get credit if I use them.