Getting Started

Important setup tips before you start

• Disable notifications and auto-lock to prevent interruptions.

• Turn off Night Shift and True Tone (if available) for color consistency.

• Turn on red Color Filter to ensure only black and red system UI elements.

Exposure Modes and Timing

Paper Exposer Pro offers four distinct exposure modes, giving you complete creative control over your darkroom printing process:

Sequential Mode

• Green and blue light phases are exposed one after another

• Ideal for classic split-grade printing

• The green phase completes fully before the blue phase begins

• Total exposure time = Green time + Blue time (+ Pause, if enabled)

Simultaneous Mode

• Green and blue light phases are exposed together

• Designed for efficient, balanced exposures

• Both colors run in parallel

Interval Mode

• Introduces a pause between exposure phases

• Useful for advanced or experimental techniques

• Pause can be automatic or triggered manually

Continuous Mode

• Runs exposure phases back-to-back without pauses

• Best for straightforward printing workflows

• Maximizes efficiency for basic exposures

Time Management and Process Status

Set your desired total exposure time and let the app take care of the details. Paper Exposer Pro automatically distributes timing across all exposure phases and pause intervals to streamline your workflow.

• Set a total exposure time, and the app calculates:

  • Phase durations (green and blue)

  • Simultaneous exposure time (if applicable)

  • Pause durations

  • Total process time

• During exposure, the app provides:

  • A real-time countdown timer

  • A clear status display showing:

    • Current phase (green, blue, pause)

    • Time remaining in current phase

    • Total exposure time

    • Pause state (if active)

Gradation Control

Paper Exposer Pro gives you precise control over image contrast through a customizable ratio of green and blue light.

• Fine-tune contrast by adjusting the ratio between green and blue light

• Controlled via a scale from 0 to 5:

  • 0 = Pure green light (soft contrast)

  • 5 = Pure blue light (hard contrast)

  • Intermediate values produce mixed contrast

• Exposure times are automatically calculated to maintain consistent light output

How to Use

Focus Mode

Use Focus Mode to precisely align your setup before exposure.

1. Tap the FOCUS button

2. The screen turns pure white at maximum brightness

3. Adjust your enlarger or image projection for optimal sharpness

4. To exit, tap the exact location where the FOCUS button was (the button is hidden during this mode)

5. Brightness automatically returns to your previously saved setting

If the app is sent to the background (e.g. by swiping or locking the device), Focus Mode will end immediately and return to the main interface to prevent unintended light exposure.

Accidental touches are ignored — only tapping the original button area exits Focus Mode safely.

Exposure Process

Exposure Mode runs the full light sequence with optional delay, pause, and manual trigger settings.

1. Configure delay and pause times as needed

2. Tap the EXPOSE button to start the exposure process

3. The screen displays the configured exposure color(s) at maximum brightness

4. To cancel exposure early, tap the exact location where the EXPOSE button was

5. After exposure completes, the screen turns black to block any stray light — tap the same spot to return to the main interface

If the app is sent to the background during exposure, the process will be immediately cancelled and the screen will go dark. This prevents accidental exposure in case of interruption.

Accidental touches are ignored — only tapping the original button area exits Expose Mode.