it evenly can be. This recently designed cinematography app does just that, Green Screener uses image banding as a way to determine the luminescence in an image. This image is a visual reference to further explain the technology, taken from the Green Screener website.
The app essentially takes your device camera and the green channel ultimately dividing them into 4, 8 and 16 bands. These can be related to the f-stops that we have learned about and thus would roughly correlate to the 2-stop, 1-stop or 1/2 stop resolution between the bands. Although Green Screener is not equivalent in the scientific sense of the f-stop it is much more accurate then a light-meter or a waveform-monitor. In simpler terms the application breaks down whatever image is being displayed and uses the bands to show different levels of light. Here is an example of the banding...
Overall if your trying to keep an evenly light background for your green screen and have a decently well trained eye accompanied with a light meter, for only $10.00 this is a significantly inexpensive tool that will do the job.
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