Coffee photograph: Rachel Michetti, courtesy of Pikolo Espresso Bar, CC0.
Source: https://github.com/scikit-image/scikit-image/blob/v0.19.3/skimage/data/coffee.png
Licence statement: https://github.com/scikit-image/scikit-image/blob/v0.19.3/skimage/data/_fetchers.py#L935-L951

The negative and positive in the app screenshots are a synthetic demonstration
based on this CC0 photograph, not a real film-stock calibration or customer scan.
Screenshots show the actual Roll frontend with demonstration desktop IPC data.
No private RAFs, purchaser details or customer photos are included.