Global Config

You can save default settings in ~/.pprc/configs/default.json so they apply to every run without needing CLI flags. CLI flags always take priority over config values.

On Windows, ~/.pprc/ resolves to %USERPROFILE%\.pprc\ (e.g. C:\Users\<you>\.pprc\).

Saving config

The easiest way to create a config is with --save-config:

pprc --clip 2.5 --dir-out ../INPUT_DIR_inverted --save-config

This saves the specified options and exits without processing.

Named configs

You can save named configs for different workflows and switch between them with --use-config:

pprc --mode bw --clip 1.0 --save-config bw

pprc --use-config bw

Named configs are saved to ~/.pprc/configs/<name>.json and are complete replacements for the default config. They are not merged with it.

Manual editing

You can also create or edit ~/.pprc/configs/default.json directly:

{
  "dirOut": "../INPUT_DIR_inverted",
  "clip": 2.5
}

Configurable options

The following options can be set in the config file:

• dirOut — output directory template
• mode — processing mode (negative, raw, e6, bw, bw-rgb)
• perImageBalancing — per-image balancing (boolean)
• noFrameRejection — disable frame rejection (boolean)
• clip — clip both ends by N%
• clipBlack — clip darkest N%
• clipWhite — clip brightest N%
• outputGamma — output gamma applied during inversion (default: 2.15)
• noStretch — disable contrast stretch (boolean)
• borderExclude — exclude outer N% from profiling
• pixelRejectionPercentage — ignore brightest/darkest N% of pixels
• profile — name of a saved inversion profile to use. Saved profiles live in ~/.pprc/profiles/<name>.json (%USERPROFILE%\.pprc\profiles\<name>.json on Windows).

Last run config

After each run, PPRC saves the effective settings to ~/.pprc/last_run_config.json. If you liked the results, you can copy it to use as your config:

macOS / Linux:

cp ~/.pprc/last_run_config.json ~/.pprc/configs/default.json

Windows:

copy %USERPROFILE%\.pprc\last_run_config.json %USERPROFILE%\.pprc\configs\default.json

Config display

When settings are loaded from config, PPRC displays them at startup so you always know what's being applied. If a CLI flag overrides a config value, both are shown.