Alt Process Exposure Cal
Vanessa Short
About this app
- Category Graphics & Design
- Age 10
- Updated Oct 30, 2025
- OS IOS
Editor reviews
Alt Process Exposure Cal is a specialized exposure calculator and darkroom companion for alternative photographic printing. Plan, test, and perfect exposures for cyanotype, platinum palladium, salt print, gum, and other UV contact-print processes. Achieve consistent results faster with accurate calculations, reusable presets, and integrated timing tools.
Core features include exposure time calculation from quick test-strip inputs or reference prints, process and paper presets to build repeatable recipes, and built-in timers and session logs to streamline your workflow. Ideal for artists, educators, and labs seeking a precise exposure calculator app for darkroom productivity and graphics and design workflows.
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How to use:
1. Download and open the app, then create a new project for your process, paper, and negative type.
2. Select a process such as cyanotype or platinum palladium, set paper and coating details, and enter your test-strip intervals or a known reference exposure.
3. Make a quick test strip, evaluate the best patch on your print, and input the chosen step so the app calculates the base exposure and any needed adjustments.
4. Start the countdown timer to expose your print, then refine with small percentage changes if your highlights or shadows need tuning.
5. Save the final exposure as a preset, add notes to the session log, and reuse or duplicate the recipe for consistent future prints or batch work.