Among projector users there are always hot discussions about ON/Off contrast, ANSI contrast or in-picture contrast.
In contrast to self-luminous displays (TVs), projectors suffer from stray light that occurs in the light path and cannot be avoided completely.
Therefore, projectiondream.com determined the Average Display Luminance (ADL) of various films a few years ago and published a set of measurement images that can be used to measure stray light in the light path.http://projectiondream.com/en/movie-brightness-adl-contrast-measurements/
So this is not calibration, but measuring projectors and of course it is not a scientific method, but more fun for real nerds.
So I created a small program that uses the remote service of ColourSpace to control the sensor and do the actual measurement. This allows to use all sensors that ColourSpace supports.
The measurement images are stored on a Raspberry Pi3 or Pi4 with PGenerator installed with Ted's Calibration Disk. Supported resolutions are 1920 x 1080 (Pi3) and 3840 x 2160 (Pi4) (16:9).
Here are some printscreens:
Access is via the Addons
page of the website
However, I explicitly point out that ADL measurements can be made on a TV or monitor, but are useless there.
Thank you very much.