Photo Paper Profiler
Grade, time and lens aperture for black-and-white darkroom printing, from light-meter readings of your negative: no test strips.
App Store – coming soonUser manualClassic web calculator
What it does
- Finds the paper grade (0–5), the time and the lens aperture that best give the grey levels (Zone System) you choose for up to four areas of the negative.
- Includes the profiles of Ilford MGFB, Ilford MGRC and Bergger PR (original and recalibrated), and lets you create the profile of any other paper from your own test strips (Profile from data).
- Works with the Gossen Luna, the Gossen Vario, a VEML7700-based instrument, the Bluetooth lightmeter you can build yourself, or your own instrument defined in My lightmeter.
- Develop, Stop and Fix timers with the names of your chemicals; saved sessions with a complete report; export and share your paper profiles.
- Works completely offline: no account, no advertising, no data collected.
- Free to download and use, including for professional darkroom work.
Requires an iPhone. Bluetooth is needed only for the optional lightmeter. In the darkroom, use the colour filter of iOS to protect the paper from the screen light (see the manual).
Bluetooth lightmeter
An incident-light meter for the darkroom with a digital VEML7700 sensor, a XIAO nRF52840 module and a LiPo battery, in a 3D-printed case. It has no display and no buttons: the app is its screen. The guide to build it is in preparation.
Free to use, rights reserved
© 2026 adesortis. No source code is published. The app, the lightmeter files and the manual are free to download and use, including for professional work; copying, modifying or any commercial use needs the author's permission. The app needs no account and does not send any data.
Documentation
User manual
Every screen, the method, troubleshooting. Online and in PDF.
Downloads
Manual (PDF), spreadsheet to profile a paper, release notes.
Support
Contacts and frequently asked questions.